drm/amd/display: Use kfree() to free rgb_user in calculate_user_regamma_ramp()

Use kfree() instead of kvfree() to free rgb_user in
calculate_user_regamma_ramp() because the memory is allocated with
kcalloc().

Signed-off-by: Denis Efremov <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/display/modules/color/color_gamma.c

···
 
 	kfree(rgb_regamma);
 rgb_regamma_alloc_fail:
-	kvfree(rgb_user);
+	kfree(rgb_user);
 rgb_user_alloc_fail:
 	return ret;
 }