bitblt.c - GdiAlphaBlend : Check for NULL Pointer

[Markus Stockhausen]

Hi,

http://bugs.winehq.org/show_bug.cgi?id=18041 reveals a bug where
GdiAlphaBlend will crash in Teamviewer application when a NULL pointer
is handed over. The attached check fixes that behaviour. 

Tanks in advance.

Markus 

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