base: genlock: add magic to protect attach from non-genlock file

It is possible for user space to attempt to attach a valid fd that
does not correspond to a genlock file. This change adds a magic to
the kernel private data that is used for validation.

CRs-fixed: 359649
Change-Id: Idb16056ba0f89b7d519d501f5b1ce6d5d930ed70
Signed-off-by: Jeff Boody <jboody@codeaurora.org>
1 file changed