scsi: bfa: Remove redundant NULL check

Fix the following warning reported by coccicheck:

drivers/scsi/bfa/bfad_debugfs.c:375:2-7: WARNING: NULL check before some freeing functions is not needed.

Link: https://lore.kernel.org/r/1647309434-13936-1-git-send-email-baihaowen@meizu.com


Signed-off-by: Haowen Bai <baihaowen@meizu.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>