cec-api: prevent leaking memory through hole in structure

mainline inclusion
from mainline-v5.9-rc1
commit 6c42227c
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I82DIP
CVE: CVE-2020-36766

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6c42227c3467549ddc65efe99c869021d2f4a570



---------------------------

Fix this smatch warning:

drivers/media/cec/core/cec-api.c:156 cec_adap_g_log_addrs() warn: check that 'log_addrs' doesn't leak information (struct has a hole after
'features')

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Zhao Wenhui <zhaowenhui8@huawei.com>