mm-video-v4l2: venc: Initialize allocate native handle variable

allocate_native_handle is not initialised for encoder resulting
it in taking random values for each instance. This is leading to
crash when the variable is initialised as true but the client doesn't
expects the same.

Change-Id: Ie6579719930d4514d9315ecaebad5e59f9636f81
CRs-Fixed: 2013243
1 file changed