Fixed GetDIBits for top-down bitmaps.

[Marvin]

Hi,

While running your changed tests on Windows, I think I found new failures.
Being a bot and all I'm not very good at pattern recognition, so I might be
wrong, but could you please double-check?
Full results can be found at
http://testbot.winehq.org/JobDetails.pl?Key=9225

Your paranoid android.


=== WNT4WSSP6 (32 bit bitmap) ===
bitmap.c:3090: Test failed: Bottom-up -> bottom-up should have first scanline.
bitmap.c:3096: Test failed: Bottom-up -> top-down should have first scanline.

=== W2KPROSP4 (32 bit bitmap) ===
bitmap.c:3090: Test failed: Bottom-up -> bottom-up should have first scanline.
bitmap.c:3096: Test failed: Bottom-up -> top-down should have first scanline.

=== WXPPROSP3 (32 bit bitmap) ===
bitmap.c:3090: Test failed: Bottom-up -> bottom-up should have first scanline.
bitmap.c:3096: Test failed: Bottom-up -> top-down should have first scanline.

=== W2K3R2SESP2 (32 bit bitmap) ===
bitmap.c:3090: Test failed: Bottom-up -> bottom-up should have first scanline.
bitmap.c:3096: Test failed: Bottom-up -> top-down should have first scanline.

=== WVISTAADM (32 bit bitmap) ===
bitmap.c:3090: Test failed: Bottom-up -> bottom-up should have first scanline.
bitmap.c:3096: Test failed: Bottom-up -> top-down should have first scanline.

=== W2K8SE (32 bit bitmap) ===
bitmap.c:3090: Test failed: Bottom-up -> bottom-up should have first scanline.
bitmap.c:3096: Test failed: Bottom-up -> top-down should have first scanline.

=== W7PRO (32 bit bitmap) ===
bitmap.c:3090: Test failed: Bottom-up -> bottom-up should have first scanline.
bitmap.c:3096: Test failed: Bottom-up -> top-down should have first scanline.

=== W7PROX64 (32 bit bitmap) ===
bitmap.c:3090: Test failed: Bottom-up -> bottom-up should have first scanline.
bitmap.c:3096: Test failed: Bottom-up -> top-down should have first scanline.

=== W7PROX64 (64 bit bitmap) ===
bitmap.c:3090: Test failed: Bottom-up -> bottom-up should have first scanline.
bitmap.c:3096: Test failed: Bottom-up -> top-down should have first scanline.