drm: do not mask out DRM_FORMAT_BIG_ENDIAN

framebuffer_check() expects that drm_get_format_info() will not fail if
the __drm_format_info() call was successful.  That'll work only in case
both are called with the same pixel_format value, so masking out the
DRM_FORMAT_BIG_ENDIAN flag isn't a good idea.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20180905060445.15008-4-kraxel@redhat.com

drivers/gpu/drm/drm_framebuffer.c

@@ -164,7 +164,7 @@ 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 & ~DRM_FORMAT_BIG_ENDIAN);
+	info = __drm_format_info(r->pixel_format);
 	if (!info) {
 		struct drm_format_name_buf format_name;