Fix some compiler warnings

Summary: There are several logic mistakes in the current code. Compiler warns about them and this patch tries to fix tnem.

Test Plan: Compiles and installs, XMPP part was not tested.

Reviewers: KDE Games, aacid

Reviewed By: aacid

Subscribers: nhirsl, aacid, chehrlic, kde-games-devel

Differential Revision: https://phabricator.kde.org/D25199