The default SCSI EH action for a non-existing EH callback is to return
FAILED, so having a callback just returning FAILED is pointless.

Link: https://lore.kernel.org/r/20220301143718.40913-3-hare@suse.de
Cc: James Smart <james.smart@broadcom.com>
Reviewed-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NJames Smart <jsmart2021@gmail.com>
Signed-off-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>