UVCG_STREAMING_CONTROL_SIZE
for (i = 0; i < UVCG_STREAMING_CONTROL_SIZE; ++i) {
h->desc.bControlSize = UVCG_STREAMING_CONTROL_SIZE;
*size += h->num_fmt * UVCG_STREAMING_CONTROL_SIZE;
sz = UVCG_STREAMING_CONTROL_SIZE;
__u8 bmaControls[UVCG_STREAMING_CONTROL_SIZE];