[media] cec-funcs.h: add length checks
Add msg->len sanity checks to fix static checker warning: include/linux/cec-funcs.h:1154 cec_ops_set_osd_string() warn: setting length 'msg->len - 3' to negative one Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com> Reported-by: NDan Carpenter <dan.carpenter@oracle.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>
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