scsi: Convert snprintf to scnprintf

Fix the coccicheck warnings:

./drivers/scsi/scsi_transport_fc.c:1967:9-17: WARNING: use scnprintf or 
sprintf
./drivers/scsi/scsi_transport_fc.c:1891:9-17: WARNING: use scnprintf or 
sprintf
./drivers/scsi/scsi_transport_fc.c:1915:9-17: WARNING: use scnprintf or 
sprintf
./drivers/scsi/scsi_transport_fc.c:2000:8-16: WARNING: use scnprintf or 
sprintf
./drivers/scsi/scsi_transport_fc.c:1304:9-17: WARNING: use scnprintf or 
sprintf
./drivers/scsi/scsi_transport_fc.c:1286:8-16: WARNING: use scnprintf or 
sprintf
./drivers/scsi/scsi_transport_fc.c:1218:10-18: WARNING: use scnprintf or 
sprintf
./drivers/scsi/scsi_transport_fc.c:1123:9-17: WARNING: use scnprintf or 
sprintf
./drivers/scsi/scsi_transport_fc.c:1665:9-17: WARNING: use scnprintf or 
sprintf

Signed-off-by: ztt <1549089851@qq.com>
---
  drivers/scsi/scsi_transport_fc.c | 18 +++++++++---------
  1 file changed, 9 insertions(+), 9 deletions(-)

  static FC_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
@@ -1215,7 +1215,7 @@ show_fc_rport_roles (struct device *dev, struct 
device_attribute *attr,
                      FC_WELLKNOWN_PORTID_MASK) {
          switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
          case FC_FPORT_PORTID:
-            return snprintf(buf, 30, "Fabric Port\n");
+            return scnprintf(buf, 30, "Fabric Port\n");
          case FC_FABCTLR_PORTID:
              return snprintf(buf, 30, "Fabric Controller\n");
          case FC_DIRSRVR_PORTID:
@@ -1283,7 +1283,7 @@ show_fc_rport_port_state(struct device *dev,
      if (!name)
          return -EINVAL;

-    return snprintf(buf, 20, "%s\n", name);
+    return scnprintf(buf, 20, "%s\n", name);
  }

  static FC_DEVICE_ATTR(rport, port_state, 0444 | 0200,
@@ -1301,7 +1301,7 @@ show_fc_rport_fast_io_fail_tmo (struct device 
*dev,
      struct fc_rport *rport = transport_class_to_rport(dev);

      if (rport->fast_io_fail_tmo == -1)
-        return snprintf(buf, 5, "off\n");
+        return scnprintf(buf, 5, "off\n");
      return snprintf(buf, 20, "%d\n", rport->fast_io_fail_tmo);
  }

@@ -1662,7 +1662,7 @@ show_fc_vport_roles (struct device *dev, struct 
device_attribute *attr,
      struct fc_vport *vport = transport_class_to_vport(dev);

      if (vport->roles == FC_PORT_ROLE_UNKNOWN)
-        return snprintf(buf, 20, "unknown\n");
+        return scnprintf(buf, 20, "unknown\n");
      return get_fc_port_roles_names(vport->roles, buf);
  }
  static FC_DEVICE_ATTR(vport, roles, S_IRUGO, show_fc_vport_roles, 
NULL);
@@ -1888,7 +1888,7 @@ show_fc_host_supported_classes (struct device 
*dev,
      struct Scsi_Host *shost = transport_class_to_shost(dev);

      if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
-        return snprintf(buf, 20, "unspecified\n");
+        return scnprintf(buf, 20, "unspecified\n");

      return get_fc_cos_names(fc_host_supported_classes(shost), buf);
  }
@@ -1912,7 +1912,7 @@ show_fc_host_supported_speeds (struct device *dev,
      struct Scsi_Host *shost = transport_class_to_shost(dev);

      if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
-        return snprintf(buf, 20, "unknown\n");
+        return scnprintf(buf, 20, "unknown\n");

      return get_fc_port_speed_names(fc_host_supported_speeds(shost), 
buf);
  }
@@ -1964,7 +1964,7 @@ show_fc_host_speed (struct device *dev,
          i->f->get_host_speed(shost);

      if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
-        return snprintf(buf, 20, "unknown\n");
+        return scnprintf(buf, 20, "unknown\n");

      return get_fc_port_speed_names(fc_host_speed(shost), buf);
  }
@@ -1997,7 +1997,7 @@ show_fc_private_host_tgtid_bind_type(struct device 
*dev,
      name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
      if (!name)
          return -EINVAL;
-    return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
+    return scnprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
  }

  #define get_list_head_entry(pos, head, member)         \