mac80211_hwsim: fix memory leak on netlink TX failure

If the packet can't be delivered to userspace (at all or
quickly enough) then it can leak - fix that.

Signed-off-by: Ben Greear <greearb@candelatech.com>
[rewrite commit message]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c
index babbdc1..a74227d 100644
--- a/drivers/net/wireless/mac80211_hwsim.c
+++ b/drivers/net/wireless/mac80211_hwsim.c
@@ -862,7 +862,7 @@
 	if (skb_queue_len(&data->pending) >= MAX_QUEUE) {
 		/* Droping until WARN_QUEUE level */
 		while (skb_queue_len(&data->pending) >= WARN_QUEUE)
-			skb_dequeue(&data->pending);
+			ieee80211_free_txskb(hw, skb_dequeue(&data->pending));
 	}
 
 	skb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_ATOMIC);
@@ -921,6 +921,7 @@
 
 nla_put_failure:
 	printk(KERN_DEBUG "mac80211_hwsim: error occurred in %s\n", __func__);
+	ieee80211_free_txskb(hw, my_skb);
 }
 
 static bool hwsim_chans_compat(struct ieee80211_channel *c1,