scsi: fnic: Replace use of sizeof with standard usage

JIRA: https://issues.redhat.com/browse/RHEL-72902

Remove cast and replace use of sizeof(struct) with standard usage of
sizeof.

Suggested-by: Dan Carpenter <dan.carpenter@linaro.org>
Fixes: a63e78e ("scsi: fnic: Add support for fabric based solicited requests and responses")
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/20250225215056.4899-1-kartilak@cisco.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
(cherry picked from commit e984fa2)
Signed-off-by: Karan Kumar <karkumar@redhat.com>

Author: Karan Kumar

drivers/scsi/fnic/fdls_disc.c

@@ -318,8 +318,7 @@ void fdls_schedule_oxid_free_retry_work(struct work_struct *work)
 			"Schedule oxid free. oxid idx: %d\n", idx);
 
 		spin_unlock_irqrestore(&fnic->fnic_lock, fnic->lock_flags);
-		reclaim_entry = (struct reclaim_entry_s *)
-						kzalloc(sizeof(struct reclaim_entry_s), GFP_KERNEL);
+		reclaim_entry = kzalloc(sizeof(*reclaim_entry), GFP_KERNEL);
 		spin_lock_irqsave(&fnic->fnic_lock, fnic->lock_flags);
 
 		if (!reclaim_entry) {