mac80211: partially fix skb->cb use

This patch fixes mac80211 to not use the skb->cb over the queue step
from virtual interfaces to the master. The patch also, for now,
disables aggregation because that would still require requeuing,
will fix that in a separate patch. There are two other places (software
requeue and powersaving stations) where requeue can happen, but that is
not currently used by any drivers/not possible to use respectively.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath5k/base.c b/drivers/net/wireless/ath5k/base.c
index 1106d1c..ff3fad7 100644
--- a/drivers/net/wireless/ath5k/base.c
+++ b/drivers/net/wireless/ath5k/base.c
@@ -1237,7 +1237,7 @@
 
 	pktlen = skb->len;
 
-	if (!(info->flags & IEEE80211_TX_CTL_DO_NOT_ENCRYPT)) {
+	if (info->control.hw_key) {
 		keyidx = info->control.hw_key->hw_key_idx;
 		pktlen += info->control.icv_len;
 	}