qcacld-3.0: Hold peer reference when handling unmap_timer_work

There is race when unamp_timer_work and peer is deleted. Hold the
reference to peer while handling the peer_unmap_timer_work.

Change-Id: Ie6cef3f13e55ab7d2310f0fff4254cde3e3c96e1
CRs-Fixed: 2381036
1 file changed