mac80211: add missing "break" statement in mesh code

This inserts a missing break statement which, if hit, would cause
the code to fall-through and unlock a spinlock twice. Noticed via
sparse's "lock count wrong in basic block" warning and careful
code inspection.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Cc: Luis Carlos Cobo <luisca@cozybit.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/mac80211/mesh_plink.c

@@ -691,6 +691,7 @@ void mesh_rx_plink_frame(struct net_device *dev, struct ieee80211_mgmt *mgmt,
 			spin_unlock_bh(&sta->plink_lock);
 			mesh_plink_frame_tx(dev, PLINK_CLOSE, sta->addr, llid,
 					    plid, reason);
+			break;
 		case OPN_ACPT:
 			if (del_timer(&sta->plink_timer))
 				sta_info_put(sta);