media: vicodec: remove WARN_ON(1) from get_q_data()

Some functions like enum_fmt use the buffer type as was passed
from userspace, which might cause the switch to fall into the
default case. Just drop the WARN_ON(1) to avoid kernel log pollution.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>