mac80211: Allow noack flag overwrite for injected frames

Allow injected unicast frames to be sent without having to wait
for an ACK.

Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/include/net/ieee80211_radiotap.h b/include/net/ieee80211_radiotap.h
index b0be5fb..7e2c4d4 100644
--- a/include/net/ieee80211_radiotap.h
+++ b/include/net/ieee80211_radiotap.h
@@ -251,6 +251,7 @@
 						 * retries */
 #define IEEE80211_RADIOTAP_F_TX_CTS	0x0002	/* used cts 'protection' */
 #define IEEE80211_RADIOTAP_F_TX_RTS	0x0004	/* used rts/cts handshake */
+#define IEEE80211_RADIOTAP_F_TX_NOACK	0x0008	/* don't expect an ack */
 
 
 /* For IEEE80211_RADIOTAP_MCS */