if of_find_device_by_node() succeed, mtk_drm_kms_init() doesn't have
a corresponding put_device(). Thus add jump target to fix the exception
handling for this function implementation.

Fixes: 8f83f268 ("drm/mediatek: Add HDMI support")
Signed-off-by: NYu Kuai <yukuai3@huawei.com>
Signed-off-by: NChun-Kuang Hu <chunkuang.hu@kernel.org>