mac80211: Initialize vif pointer

Before calling update_beacon() mac80211 must
initialize the control.vif pointer so it can
be used by the driver to determine which
interface is trying to send the beacon.

v2: ieee80211_beacon_get() should also initialize the
vif pointer since it can be called by mac80211 internally
before calling config_interface().

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/ieee80211_sta.c b/net/mac80211/ieee80211_sta.c
index 866eb80..8b47d81 100644
--- a/net/mac80211/ieee80211_sta.c
+++ b/net/mac80211/ieee80211_sta.c
@@ -2787,6 +2787,7 @@
 			       "for IBSS beacon\n", dev->name);
 			break;
 		}
+		control.vif = &sdata->vif;
 		control.tx_rate =
 			(sdata->bss_conf.use_short_preamble &&
 			(ratesel.rate->flags & IEEE80211_RATE_PREAMBLE2)) ?