mt76: mt7915: fix potential memory leak in mcu message handler

Fix potential memory leak in mcu message handler on error condition.

Fixes: c6b002bcdfa6 ("mt76: add mac80211 driver for MT7915 PCIe-based chipsets")
Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7915/mcu.c

@@ -312,8 +312,10 @@ mt7915_mcu_parse_response(struct mt7915_dev *dev, int cmd,
 	struct mt7915_mcu_rxd *rxd = (struct mt7915_mcu_rxd *)skb->data;
 	int ret = 0;
 
-	if (seq != rxd->seq)
-		return -EAGAIN;
+	if (seq != rxd->seq) {
+		ret = -EAGAIN;
+		goto out;
+	}
 
 	switch (cmd) {
 	case -MCU_CMD_PATCH_SEM_CONTROL:
@@ -330,6 +332,7 @@ mt7915_mcu_parse_response(struct mt7915_dev *dev, int cmd,
 	default:
 		break;
 	}
+out:
 	dev_kfree_skb(skb);
 
 	return ret;