scsi: fnic: Return appropriate error code for mem alloc failure

Return appropriate error code from fnic_probe when memory create slab pool
fails. Fix bug report.

Suggested-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Sesidhar Baddela <sebaddel@cisco.com>
Reviewed-by: Arulprabhu Ponnusamy <arulponn@cisco.com>
Reviewed-by: Gian Carlo Boffa <gcboffa@cisco.com>
Reviewed-by: Arun Easi <aeasi@cisco.com>
Signed-off-by: Karan Tilak Kumar <kartilak@cisco.com>
Link: https://lore.kernel.org/r/20250110091746.17671-1-kartilak@cisco.com


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