media: vimc: Fix error return code in vimc_register_devices()

Fix to return a negative error code from the error handling
case instead of 0, as done elsewhere in this function.

Fixes: f13d5f36 ("media: vimc: Collapse component structure into a single monolithic driver")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Acked-by: Helen Koike <helen.koike@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>