Change LoadString according to the test

[Vitaly Lipatov]

As I see with
$ find -type f -name "*.c" | xargs grep LoadString | grep NULL
run with buffer = NULL is used in Wine only here:
./dlls/hhctrl.ocx/help.c:    iSize = LoadStringW(hhctrl_hinstance, dwID, NULL, 0);
and needs be rewritten for compatibity (see my next patch).

Changelog:
- change LoadString according to the test (return 0 if buffer = NULL)

-- 
Vitaly Lipatov, ALT Linux Team
Russia, Saint-Petersburg, www.etersoft.ru
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