net: ethernet: mtk_eth_soc: add check for allocation failure

Check if the kzalloc() failed.

Fixes: 804775df ("net: ethernet: mtk_eth_soc: add support for Wireless Ethernet Dispatch (WED)")
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/mediatek/mtk_wed.c

@@ -827,6 +827,8 @@ void mtk_wed_add_hw(struct device_node *np, struct mtk_eth *eth,
 		goto unlock;
 
 	hw = kzalloc(sizeof(*hw), GFP_KERNEL);
+	if (!hw)
+		goto unlock;
 	hw->node = np;
 	hw->regs = regs;
 	hw->eth = eth;