muc: do check for equality twice

We already performed the presence.getFrom().equals(myRoomJID) check
and saved its result. No need to do it again.

smack-extensions/src/main/java/org/jivesoftware/smackx/muc/MultiUserChat.java

@@ -236,7 +236,7 @@ public class MultiUserChat {
                         // Fire events according to the received presence code
                         checkPresenceCode(
                             mucUser.getStatus(),
-                            presence.getFrom().equals(myRoomJID),
+                            isUserStatusModification,
                             mucUser,
                             from);
                     } else {