[12743] Fix some static code analysis warnings and improve performance

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Автор: stfx


<pre style='white-space:pre-wrap;width:81ex'>[12743] Fix some static code analysis warnings and improve performance</pre>


Подробнее... (https://github.com/cmangos/mangos-wotlk/commit/3f9b4e8e786f4e11e012a434c369e76622db9550)