ath11k: fix error return code in ath11k_dp_alloc()

Fix to return negative error code -ENOMEM from the error handling
case instead of 0, as done elsewhere in this function.

Fixes: d0998eb ("ath11k: optimise ath11k_dp_tx_completion_handler")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200427104621.23752-1-weiyongjun1@huawei.com

drivers/net/wireless/ath/ath11k/dp.c

@@ -911,8 +911,10 @@ int ath11k_dp_alloc(struct ath11k_base *ab)
 		dp->tx_ring[i].tx_status_head = 0;
 		dp->tx_ring[i].tx_status_tail = DP_TX_COMP_RING_SIZE - 1;
 		dp->tx_ring[i].tx_status = kmalloc(size, GFP_KERNEL);
-		if (!dp->tx_ring[i].tx_status)
+		if (!dp->tx_ring[i].tx_status) {
+			ret = -ENOMEM;
 			goto fail_cmn_srng_cleanup;
+		}
 	}
 
 	for (i = 0; i < HAL_DSCP_TID_MAP_TBL_NUM_ENTRIES_MAX; i++)