[media] media: info leak in __media_device_enum_links()

These structs have holes and reserved struct members which aren't
cleared.  I've added a memset() so we don't leak stack information.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

Change-Id: Ia22c66d36c0a7bcaee60e65a7db406a40f973006
Git-commit: c88e739b1fad662240e99ecbd0bdaac871717987
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Signed-off-by: Deva Ramasubramanian <dramasub@codeaurora.org>