d3d9: Use color_match() in fog_with_shader_test().

dlls/d3d9/tests/visual.c

@@ -1463,9 +1463,7 @@ static void fog_with_shader_test(IDirect3DDevice9 *device)
 
             /* As the red and green component are the result of blending use 5% tolerance on the expected value */
             color = getPixelColor(device, 128, 240);
-            ok((unsigned char)(color) == ((unsigned char)test_data[i].color[j])
-                    && abs( ((unsigned char)(color>>8)) - (unsigned char)(test_data[i].color[j]>>8) ) < 13
-                    && abs( ((unsigned char)(color>>16)) - (unsigned char)(test_data[i].color[j]>>16) ) < 13,
+            ok(color_match(color, test_data[i].color[j], 13),
                "fog vs%i ps%i fvm%i ftm%i %d: got color %08x, expected %08x +-5%%\n",
                test_data[i].vshader, test_data[i].pshader, test_data[i].vfog, test_data[i].tfog, j, color, test_data[i].color[j]);
         }