fix clang compiler warnings and minor logical error

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Автор: insunaa

fix clang compiler warnings and minor logical errorremove override mark to fix windows+gcc compilationclose #493

Подробнее... (https://github.com/cmangos/mangos-wotlk/commit/53c8c3a5a78a9eb8fd353f6944e76a6e2119e4be)