mwifiex: Fix mem leak in mwifiex_tm_cmd

'hostcmd' is alloced by kzalloc, should be freed before
leaving from the error handling cases, otherwise it will
cause mem leak.

Fixes: 3935ccc14d ("mwifiex: add cfg80211 testmode support")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/marvell/mwifiex/cfg80211.c

@@ -4082,16 +4082,20 @@ static int mwifiex_tm_cmd(struct wiphy *wiphy, struct wireless_dev *wdev,
 
 		if (mwifiex_send_cmd(priv, 0, 0, 0, hostcmd, true)) {
 			dev_err(priv->adapter->dev, "Failed to process hostcmd\n");
+			kfree(hostcmd);
 			return -EFAULT;
 		}
 
 		/* process hostcmd response*/
 		skb = cfg80211_testmode_alloc_reply_skb(wiphy, hostcmd->len);
-		if (!skb)
+		if (!skb) {
+			kfree(hostcmd);
 			return -ENOMEM;
+		}
 		err = nla_put(skb, MWIFIEX_TM_ATTR_DATA,
 			      hostcmd->len, hostcmd->cmd);
 		if (err) {
+			kfree(hostcmd);
 			kfree_skb(skb);
 			return -EMSGSIZE;
 		}