[ Upstream commit 33dfeb62e23c31619d2197850f7e8b50e8cc5466 ]

Do not access sd_formats[] if num_of_sd_formats is zero, ie
subdev sensor didn't expose any formats.
Signed-off-by: NHugues Fruchet <hugues.fruchet@st.com>
Signed-off-by: NHans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: NMauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>