BmpSupportLib: fix BMP validation

BMP files by tools other than MS paint can have a
variable number of padding bytes, which results in
the DataSize being less than (ImageSize - HeaderSize).
Fix the check to be less stringent.

Test: use BMP created by/saved by Photoshop

Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>

MdeModulePkg/Library/BaseBmpSupportLib/BmpSupportLib.c

@@ -216,7 +216,7 @@ TranslateBmpToGopBlt (
 
   if ((BmpHeader->Size != BmpImageSize) ||
       (BmpHeader->Size < BmpHeader->ImageOffset) ||
-      (BmpHeader->Size - BmpHeader->ImageOffset != DataSize))
+      (BmpHeader->Size - BmpHeader->ImageOffset < DataSize))
   {
     DEBUG ((DEBUG_ERROR, "TranslateBmpToGopBlt: invalid BmpImage... \n"));
     DEBUG ((DEBUG_ERROR, "   BmpHeader->Size: 0x%x\n", BmpHeader->Size));