drm: Eliminate the useless "non-RGB fb" debug message

No point in spamming the log whenever a non-RGB fb is being
constructed. And since there's nothing to do anymore that
fb->bits_per_pixel and fb->depth are gone, we can just kill
off this entire piece of code.

Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1479498793-31021-36-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

drivers/gpu/drm/drm_modeset_helper.c

@@ -72,21 +72,10 @@ void drm_helper_mode_fill_fb_struct(struct drm_device *dev,
 				    struct drm_framebuffer *fb,
 				    const struct drm_mode_fb_cmd2 *mode_cmd)
 {
-	const struct drm_format_info *info;
 	int i;
 
-	info = drm_format_info(mode_cmd->pixel_format);
-	if (!info || !info->depth) {
-		struct drm_format_name_buf format_name;
-
-		DRM_DEBUG_KMS("non-RGB pixel format %s\n",
-		              drm_get_format_name(mode_cmd->pixel_format,
-		                                  &format_name));
-	} else {
-	}
-
 	fb->dev = dev;
-	fb->format = info;
+	fb->format = drm_format_info(mode_cmd->pixel_format);
 	fb->width = mode_cmd->width;
 	fb->height = mode_cmd->height;
 	for (i = 0; i < 4; i++) {