tests/color_util: prettify arr_curves

Fix up whitespace and document what this array is for.

For the sake of slightly better readability.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>

tests/color_util.c

@@ -50,6 +50,7 @@ struct color_tone_curve {
 	double param[5];
 };
 
+/* Mapping from enum transfer_fn to LittleCMS curve parameters. */
 const struct color_tone_curve arr_curves[] = {
 	{
 		.fn = TRANSFER_FN_SRGB_EOTF,
@@ -69,7 +70,6 @@ const struct color_tone_curve arr_curves[] = {
 		.internal_type = 1,
 		.param = { 2.4, 0.0, 0.0, 0.0 , 0.0 },
 	}
-
 };
 
 bool