Fixed return value in CheckMultiLogin()

src/ClientHandle.cpp

@@ -1816,9 +1816,10 @@ bool cClientHandle::CheckMultiLogin(const AString & a_Username)
 	if (cRoot::Get()->DoWithPlayer(a_Username, Callback))
 	{
 		Kick("A player of the username is already logged in");
-	}
 		return false;
 	}
+	return true;
+}