Bad mini/max check in setting control values (the gamma in
zc3xx could be set to null).
Signed-off-by: NRabin Vincent <rabin@rab.in>
Signed-off-by: NJean-Francois Moine <moinejf@free.fr>
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>