qcacmn: Avoid reference of peer object after peer_teardown

In API dp_peer_find_by_id return NULL if delete_in_progress
bit is set, this will avoid referencing peer memory which will
be free in peer_unmap event asynchronously.

Change-Id: Ieab559b9274a886809a9baa9bb348d348e924625
CRs-fixed: 2194265
3 files changed