libpipi: fix a sign bug in the GDI loader.

git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/libpipi/trunk@2909 92316355-f0b4-4df1-b90c-862c8a59935f

pipi/codec/gdi.c

@@ -60,7 +60,7 @@ pipi_image_t *pipi_load_gdi(const char *name)
     binfo.bmiHeader.biBitCount = 32;
     binfo.bmiHeader.biCompression = BI_RGB;
     binfo.bmiHeader.biHeight = - abs(binfo.bmiHeader.biHeight);
-    if(!GetDIBits(hdc, hbmap, 0, binfo.bmiHeader.biHeight, data,
+    if(!GetDIBits(hdc, hbmap, 0, abs(binfo.bmiHeader.biHeight), data,
                   &binfo, DIB_RGB_COLORS))
     {
         ReleaseDC(0, hdc);