RDMA/qedr: clean up work queue on failure in qedr_alloc_resources()

Add a check for if create_singlethread_workqueue() fails and also destroy
the work queue on failure paths.

Fixes: e411e05 ("RDMA/qedr: Add iWARP connection management functions")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/Y1gBkDucQhhWj5YM@kili
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/hw/qedr/main.c

@@ -344,14 +344,18 @@ static int qedr_alloc_resources(struct qedr_dev *dev)
 	if (IS_IWARP(dev)) {
 		xa_init(&dev->qps);
 		dev->iwarp_wq = create_singlethread_workqueue("qedr_iwarpq");
+		if (!dev->iwarp_wq) {
+			rc = -ENOMEM;
+			goto err1;
+		}
 	}
 
 	/* Allocate Status blocks for CNQ */
 	dev->sb_array = kcalloc(dev->num_cnq, sizeof(*dev->sb_array),
 				GFP_KERNEL);
 	if (!dev->sb_array) {
 		rc = -ENOMEM;
-		goto err1;
+		goto err_destroy_wq;
 	}
 
 	dev->cnq_array = kcalloc(dev->num_cnq,
@@ -402,6 +406,9 @@ static int qedr_alloc_resources(struct qedr_dev *dev)
 	kfree(dev->cnq_array);
 err2:
 	kfree(dev->sb_array);
+err_destroy_wq:
+	if (IS_IWARP(dev))
+		destroy_workqueue(dev->iwarp_wq);
 err1:
 	kfree(dev->sgid_tbl);
 	return rc;