RICHEDIT20: fix EM_GETSEL

[Vitaly Lipatov]

I see MSDN allows to use EM_GETSEL with null in any argument, so 
implement it.

Changelog:
 - allow null pointers for EM_GETSEL message (as MSDN says)

-- 
Lav
Vitaly Lipatov
Saint-Petersburg, Etersoft www.etersoft.ru
GNU! ALT Linux Team! WINE! LaTeX! LyX!
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