mt7601u: add missing release on skb in mt7601u_mcu_msg_send

In the implementation of mt7601u_mcu_msg_send(), skb is supposed to be
consumed on all execution paths. Release skb before returning if
test_bit() fails.
Signed-off-by: Navid Emamdoost <navid.emamdoost@gmail.com>
Acked-by: Jakub Kicinski <kubakici@wp.pl>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200718052630.11032-1-navid.emamdoost@gmail.com

drivers/net/wireless/mediatek/mt7601u/mcu.c

@@ -116,8 +116,10 @@ mt7601u_mcu_msg_send(struct mt7601u_dev *dev, struct sk_buff *skb,
 	int sent, ret;
 	u8 seq = 0;
 
-	if (test_bit(MT7601U_STATE_REMOVED, &dev->state))
+	if (test_bit(MT7601U_STATE_REMOVED, &dev->state)) {
+		consume_skb(skb);
 		return 0;
+	}
 
 	mutex_lock(&dev->mcu.mutex);