gpu: nvgpu: validate wait notification offset

(cherry pick from commit 1f9ba996a484f50bbe60762be021479e34c35eaa)

Make sure that the notification object fits within the supplied buffer.

Bug:27299111

Change-Id: Ifb66f848e3758438f37645be6f534f5b60260214
Signed-off-by: Konsta Holtta <kholtta@nvidia.com>
1 file changed