Fix closing during saving session

(cherry picked from commit 56137a1306)

kaffeine/src/kaffeine.cpp

@@ -1523,7 +1523,9 @@ void Kaffeine::slotQuit()
 		m_systemTray = NULL;
 	}*/
 
-	KApplication::exit(0);
+	if ( !kapp->sessionSaving() ) {
+	    KApplication::exit(0);
+	}
 }
 
 void Kaffeine::closeEvent(TQCloseEvent* e)