[media] v4l2-subdev.c: add 'which' checks for enum ops

Return an error if an invalid 'which' valid is passed in.

Signed-off-by: Hans Verkuil <[email protected]>
Acked-by: Lad, Prabhakar <[email protected]>
Tested-by: Lad, Prabhakar <[email protected]>
Acked-by: Laurent Pinchart <[email protected]>
Acked-by: Sylwester Nawrocki <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>
1 file changed