Fix CMAP palette bounds in Amiga ILBM decoder

Author: segrax

Source/Amiga/Graphics_Amiga.cpp

@@ -615,9 +615,11 @@ sImage cGraphics_Amiga::DecodeIFF(const std::string& pFilename) {
 				d0 = (int16)d0;
 				Final += d0;
 
-				Result.mPalette[i].mRed = ((Final >> 8) & 0xF) << 2;
-				Result.mPalette[i].mGreen = ((Final >> 4) & 0xF) << 2;
-				Result.mPalette[i].mBlue = ((Final >> 0) & 0xF) << 2;
+				if (i < 256) {
+					Result.mPalette[i].mRed = ((Final >> 8) & 0xF) << 2;
+					Result.mPalette[i].mGreen = ((Final >> 4) & 0xF) << 2;
+					Result.mPalette[i].mBlue = ((Final >> 0) & 0xF) << 2;
+				}
 
 				FileSize -= 3;