Fix error testing when using V4L2_FMTDESC_FLAG_ENUM_ALL by using both errno and the return value. Fixes !7686 (merged) Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/7873>
Fix error testing when using V4L2_FMTDESC_FLAG_ENUM_ALL by using both errno and the return value. Fixes !7686 (merged) Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/7873>