Merge pull request #2900 from aquarhead/protect-muc-owner

Protect against bad muc#owner requests

src/mod_muc_room.erl

@@ -3370,7 +3370,9 @@ process_iq_owner(From, #iq{type = get, lang = Lang,
 	    end;
        true ->
 	    {error, xmpp:err_bad_request()}
-    end.
+    end;
+process_iq_owner(_, _, _) ->
+	  {error, xmpp:err_bad_request()}.
 
 -spec is_allowed_log_change(muc_roomconfig:result(), state(), jid()) -> boolean().
 is_allowed_log_change(Options, StateData, From) ->