gpu/drm: cleanup coding style a bit

Remove first assignment to info which is meaningless.
Put the width and higth check first.
This change is to make the code a bit readable.

Signed-off-by: Bernard Zhao <bernard@vivo.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20200907123129.27905-1-bernard@vivo.com

drivers/gpu/drm/drm_framebuffer.c

@@ -176,8 +176,7 @@ static int framebuffer_check(struct drm_device *dev,
 	int i;
 
 	/* check if the format is supported at all */
-	info = __drm_format_info(r->pixel_format);
-	if (!info) {
+	if (!__drm_format_info(r->pixel_format)) {
 		struct drm_format_name_buf format_name;
 
 		DRM_DEBUG_KMS("bad framebuffer format %s\n",
@@ -186,9 +185,6 @@ static int framebuffer_check(struct drm_device *dev,
 		return -EINVAL;
 	}
 
-	/* now let the driver pick its own format info */
-	info = drm_get_format_info(dev, r);
-
 	if (r->width == 0) {
 		DRM_DEBUG_KMS("bad framebuffer width %u\n", r->width);
 		return -EINVAL;
@@ -199,6 +195,9 @@ static int framebuffer_check(struct drm_device *dev,
 		return -EINVAL;
 	}
 
+	/* now let the driver pick its own format info */
+	info = drm_get_format_info(dev, r);
+
 	for (i = 0; i < info->num_planes; i++) {
 		unsigned int width = fb_plane_width(r->width, info, i);
 		unsigned int height = fb_plane_height(r->height, info, i);