In the backport of commit 4f7b0d26 ("drm: rcar-du: Simplify and fix
probe error handling"), which is commit 8255d263 in this tree, the
error handling path was incorrect.  This patch fixes it up.
Reported-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Cc: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Cc: thongsyho <thong.ho.px@rvc.renesas.com>
Cc: Nhan Nguyen <nhan.nguyen.yb@renesas.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>