mac80211: fix the check for cloned skbs in the tx path

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@25398 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/mac80211/patches/590-mac80211_fix_clone_check.patch

@@ -0,0 +1,11 @@
+--- a/net/mac80211/tx.c
++++ b/net/mac80211/tx.c
+@@ -1547,7 +1547,7 @@ static int ieee80211_skb_resize(struct i
+ 		skb_orphan(skb);
+ 	}
+ 
+-	if (skb_header_cloned(skb))
++	if (skb_cloned(skb))
+ 		I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
+ 	else if (head_need || tail_need)
+ 		I802_DEBUG_INC(local->tx_expand_skb_head);