media: v4l2-ctrls.c: fix shift-out-of-bounds in std_validate

If a menu has more than 64 items, then don't check menu_skip_mask
for items 65 and up.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Reported-by:  <syzbot+42d8c7c3d3e594b34346@syzkaller.appspotmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>