[PATCH 3/6] COMDLG32: check hook pointer

[Vitaly Lipatov]

Changelog:
add check for hook pointer before using

-- 
Lav
Виталий Липатов
Россия, Санкт-Петербург. www.etersoft.ru
GNU! ALT Linux Team! WINE! WIKI! LaTeX! LyX!
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