[try3] gdi32: bitblt.c. Fix copying from uninitialized memory

[Alexander Demakin]

This patch adds check of return value of GetDIBits in BitBlt.c. If a error 
occurs, GetDIBits returns 0 and bits variable points to  uninitialized data.  
It always occurs when calling BitBlt for printer context due to 
implementation of PSDRV_SelectBitmap().
Changelog:
        gdi32.dll Fix copying from uninitialized memory.
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