parseutils: include errors in test output.

libavutil/parseutils.c

@@ -769,6 +769,8 @@ int main(void)
         for (i = 0;  i < FF_ARRAY_ELEMS(color_names); i++) {
             if (av_parse_color(rgba, color_names[i], -1, NULL) >= 0)
                 printf("%s -> R(%d) G(%d) B(%d) A(%d)\n", color_names[i], rgba[0], rgba[1], rgba[2], rgba[3]);
+            else
+                printf("%s -> error\n", color_names[i]);
         }
     }