[0/7] media: atomisp: Address several clang warnings

Hi all,

This series aims to clean up the code while addressing the majority of
clang warnings in this driver, some found by the 0day bot and others
found by me.

There are several enum conversion warnings that happen, which I do not
really know how to solve without understanding how exactly this driver
works. I would appreciate some guidance or a solution. Below are the
warnings, sorry for not wrapping them but they would be hard to read
otherwise.

../drivers/staging/media/atomisp/pci/atomisp_subdev.c:49:65: warning: implicit conversion from enumeration type 'enum ia_css_frame_format' to different enumeration type 'enum atomisp_input_format' [-Wenum-conversion]
        { V4L2_MBUS_FMT_CUSTOM_NV21, 12, 12, CSS_FRAME_FORMAT_NV21, 0, CSS_FRAME_FORMAT_NV21 },
        ~                                                              ^~~~~~~~~~~~~~~~~~~~~
../drivers/staging/media/atomisp//pci/atomisp_compat.h:101:32: note: expanded from macro 'CSS_FRAME_FORMAT_NV21'
#define CSS_FRAME_FORMAT_NV21           CSS_ID(CSS_FRAME_FORMAT_NV21)
                                        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../drivers/staging/media/atomisp//pci/atomisp_compat_css20.h:117:22: note: expanded from macro 'CSS_ID'
#define CSS_ID(val)     (IA_ ## val)
                         ^~~~~~~~~~
<scratch space>:69:1: note: expanded from here
IA_CSS_FRAME_FORMAT_NV21
^~~~~~~~~~~~~~~~~~~~~~~~
../drivers/staging/media/atomisp/pci/atomisp_subdev.c:49:39: warning: implicit conversion from enumeration type 'enum ia_css_frame_format' to different enumeration type 'enum atomisp_input_format' [-Wenum-conversion]
        { V4L2_MBUS_FMT_CUSTOM_NV21, 12, 12, CSS_FRAME_FORMAT_NV21, 0, CSS_FRAME_FORMAT_NV21 },
        ~                                    ^~~~~~~~~~~~~~~~~~~~~
../drivers/staging/media/atomisp//pci/atomisp_compat.h:101:32: note: expanded from macro 'CSS_FRAME_FORMAT_NV21'
#define CSS_FRAME_FORMAT_NV21           CSS_ID(CSS_FRAME_FORMAT_NV21)
                                        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../drivers/staging/media/atomisp//pci/atomisp_compat_css20.h:117:22: note: expanded from macro 'CSS_ID'
#define CSS_ID(val)     (IA_ ## val)
                         ^~~~~~~~~~
<scratch space>:68:1: note: expanded from here
IA_CSS_FRAME_FORMAT_NV21
^~~~~~~~~~~~~~~~~~~~~~~~
../drivers/staging/media/atomisp/pci/atomisp_subdev.c:48:65: warning: implicit conversion from enumeration type 'enum ia_css_frame_format' to different enumeration type 'enum atomisp_input_format' [-Wenum-conversion]
        { V4L2_MBUS_FMT_CUSTOM_NV12, 12, 12, CSS_FRAME_FORMAT_NV12, 0, CSS_FRAME_FORMAT_NV12 },
        ~                                                              ^~~~~~~~~~~~~~~~~~~~~
../drivers/staging/media/atomisp//pci/atomisp_compat.h:99:32: note: expanded from macro 'CSS_FRAME_FORMAT_NV12'
#define CSS_FRAME_FORMAT_NV12           CSS_ID(CSS_FRAME_FORMAT_NV12)
                                        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../drivers/staging/media/atomisp//pci/atomisp_compat_css20.h:117:22: note: expanded from macro 'CSS_ID'
#define CSS_ID(val)     (IA_ ## val)
                         ^~~~~~~~~~
<scratch space>:67:1: note: expanded from here
IA_CSS_FRAME_FORMAT_NV12
^~~~~~~~~~~~~~~~~~~~~~~~
../drivers/staging/media/atomisp/pci/atomisp_subdev.c:48:39: warning: implicit conversion from enumeration type 'enum ia_css_frame_format' to different enumeration type 'enum atomisp_input_format' [-Wenum-conversion]
        { V4L2_MBUS_FMT_CUSTOM_NV12, 12, 12, CSS_FRAME_FORMAT_NV12, 0, CSS_FRAME_FORMAT_NV12 },
        ~                                    ^~~~~~~~~~~~~~~~~~~~~
../drivers/staging/media/atomisp//pci/atomisp_compat.h:99:32: note: expanded from macro 'CSS_FRAME_FORMAT_NV12'
#define CSS_FRAME_FORMAT_NV12           CSS_ID(CSS_FRAME_FORMAT_NV12)
                                        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../drivers/staging/media/atomisp//pci/atomisp_compat_css20.h:117:22: note: expanded from macro 'CSS_ID'
#define CSS_ID(val)     (IA_ ## val)
                         ^~~~~~~~~~
<scratch space>:66:1: note: expanded from here
IA_CSS_FRAME_FORMAT_NV12
^~~~~~~~~~~~~~~~~~~~~~~~
../drivers/staging/media/atomisp/pci/atomisp_subdev.c:47:34: warning: implicit conversion from enumeration type 'enum ia_css_frame_format' to different enumeration type 'enum atomisp_input_format' [-Wenum-conversion]
        { MEDIA_BUS_FMT_JPEG_1X8, 8, 8, CSS_FRAME_FORMAT_BINARY_8, 0, ATOMISP_INPUT_FORMAT_BINARY_8 },
        ~                               ^~~~~~~~~~~~~~~~~~~~~~~~~
../drivers/staging/media/atomisp//pci/atomisp_compat.h:118:35: note: expanded from macro 'CSS_FRAME_FORMAT_BINARY_8'
#define CSS_FRAME_FORMAT_BINARY_8       CSS_ID(CSS_FRAME_FORMAT_BINARY_8)
                                        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../drivers/staging/media/atomisp//pci/atomisp_compat_css20.h:117:22: note: expanded from macro 'CSS_ID'
#define CSS_ID(val)     (IA_ ## val)
                         ^~~~~~~~~~
<scratch space>:65:1: note: expanded from here
IA_CSS_FRAME_FORMAT_BINARY_8
^~~~~~~~~~~~~~~~~~~~~~~~~~~~
5 warnings generated.

Please let me know if there are any comments, cheers!
Nathan