scsi: lpfc: Check the return value of alloc_workqueue()

The function alloc_workqueue() in lpfc_sli4_driver_resource_setup() can
fail, but there is no check of its return value. The return value should be
checked.

Link: https://lore.kernel.org/r/[email protected]
Fixes: 3cee98d ("scsi: lpfc: Fix crash on driver unload in wq free")
Reported-by: Hacash Robot <[email protected]>
Reviewed-by: James Smart <[email protected]>
Signed-off-by: William Dean <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

Author: William Dean

drivers/scsi/lpfc/lpfc_init.c

@@ -7948,6 +7948,8 @@ lpfc_sli4_driver_resource_setup(struct lpfc_hba *phba)
 
 	/* The lpfc_wq workqueue for deferred irq use */
 	phba->wq = alloc_workqueue("lpfc_wq", WQ_MEM_RECLAIM, 0);
+	if (!phba->wq)
+		return -ENOMEM;
 
 	/*
 	 * Initialize timers used by driver