scsi_transport_fc: Unexport scsi_is_fc_vport()

Running the command "git grep -nHw scsi_is_fc_vport" shows that this
function is only called from inside scsi_transport_fc.c. Hence unexport
this function.

Signed-off-by: Bart Van Assche <[e-mail]>
Cc: Hannes Reinecke <[e-mail]>
Cc: James Smart <[e-mail]>
Reviewed-by: Hannes Reinicke <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/scsi/scsi_transport_fc.c

···
 	kfree(vport);
 }
 
-int scsi_is_fc_vport(const struct device *dev)
+static int scsi_is_fc_vport(const struct device *dev)
 {
 	return dev->release == fc_vport_dev_release;
 }
-EXPORT_SYMBOL(scsi_is_fc_vport);
 
 static int fc_vport_match(struct attribute_container *cont,
 			    struct device *dev)