fcoe: add missing destroy_workqueue() on error in fcoe_init()

Add the missing destroy_workqueue() before return from fcoe_init() in
the fcoe transport register failed error handling case.
Signed-off-by: NWei Yongjun <weiyj.lk@gmail.com>
Acked-by: NJohannes Thumshirn <jth@kernel.org>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/fcoe/fcoe.c

@@ -2495,7 +2495,7 @@ static int __init fcoe_init(void)
 	if (rc) {
 		printk(KERN_ERR "failed to register an fcoe transport, check "
 			"if libfcoe is loaded\n");
-		return rc;
+		goto out_destroy;
 	}
 
 	mutex_lock(&fcoe_config_mutex);
@@ -2518,6 +2518,7 @@ static int __init fcoe_init(void)
 
 out_free:
 	mutex_unlock(&fcoe_config_mutex);
+out_destroy:
 	destroy_workqueue(fcoe_wq);
 	return rc;
 }