softmac: Fix deadlock of wx_set_essid with assoc work

Index: bu3sch-wireless-dev/net/ieee80211/softmac/ieee80211softmac_wx.c
===================================================================
@@ -98,9 +98,12 @@ ieee80211softmac_wx_set_essid(struct net
 				cancel_delayed_work(&authptr->work);
 			sm->associnfo.bssvalid = 0;
 			sm->associnfo.bssfixed = 0;
-			flush_scheduled_work();
 			sm->associnfo.associating = 0;
 			sm->associnfo.associated = 0;
+			/* Unlock mutex, otherwise we deadlock with the assoc work handler. */
+			mutex_unlock(&sm->associnfo.mutex);
+			flush_scheduled_work();
+			mutex_lock(&sm->associnfo.mutex);
 		}
 	}