RDMA/rxe: Clean kzalloc failure paths

There is no need to print any debug messages after failure to
allocate memory, because kernel will print OOM dumps anyway.

Together with removal of these messages, remove useless goto jumps.

Fixes: 5bf944f24129 ("RDMA/rxe: Add error messages")
Reported-by: Dan Carpenter <[e-mail]>
Link: https://lore.kernel.org/all/[e-mail]
Link: https://lore.kernel.org/r/[e-mail]
Reviewed-by: Bob Pearson <[e-mail]>
Signed-off-by: Leon Romanovsky <[e-mail]>

drivers/infiniband/sw/rxe/rxe_queue.c

···
 
 	/* num_elem == 0 is allowed, but uninteresting */
 	if (*num_elem < 0)
-		goto err1;
+		return NULL;
 
 	q = kzalloc(sizeof(*q), GFP_KERNEL);
 	if (!q)
-		goto err1;
+		return NULL;
 
 	q->rxe = rxe;
 	q->type = type;
···
 
 err2:
 	kfree(q);
-err1:
 	return NULL;
 }
 

drivers/infiniband/sw/rxe/rxe_verbs.c

···
 	int err;
 
 	mr = kzalloc(sizeof(*mr), GFP_KERNEL);
-	if (!mr) {
-		err = -ENOMEM;
-		rxe_dbg_dev(rxe, "no memory for mr");
-		goto err_out;
-	}
+	if (!mr)
+		return ERR_PTR(-ENOMEM);
 
 	err = rxe_add_to_pool(&rxe->mr_pool, mr);
 	if (err) {
···
 
 err_free:
 	kfree(mr);
-err_out:
 	rxe_err_pd(pd, "returned err = %d", err);
 	return ERR_PTR(err);
 }
···
 	int err, cleanup_err;
 
 	mr = kzalloc(sizeof(*mr), GFP_KERNEL);
-	if (!mr) {
-		err = -ENOMEM;
-		rxe_dbg_pd(pd, "no memory for mr");
-		goto err_out;
-	}
+	if (!mr)
+		return ERR_PTR(-ENOMEM);
 
 	err = rxe_add_to_pool(&rxe->mr_pool, mr);
 	if (err) {
···
 		rxe_err_mr(mr, "cleanup failed, err = %d", cleanup_err);
 err_free:
 	kfree(mr);
-err_out:
 	rxe_err_pd(pd, "returned err = %d", err);
 	return ERR_PTR(err);
 }
···
 	}
 
 	mr = kzalloc(sizeof(*mr), GFP_KERNEL);
-	if (!mr) {
-		err = -ENOMEM;
-		rxe_dbg_mr(mr, "no memory for mr");
-		goto err_out;
-	}
+	if (!mr)
+		return ERR_PTR(-ENOMEM);
 
 	err = rxe_add_to_pool(&rxe->mr_pool, mr);
-	if (err) {
-		rxe_dbg_mr(mr, "unable to create mr, err = %d", err);
+	if (err)
 		goto err_free;
-	}
 
 	rxe_get(pd);
 	mr->ibmr.pd = ibpd;