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Start listener thread only after successful open call
Use case: Stress tests ON\OFF with different concurrent
scenarios
Failure: Crash in btsnoop_net_listen thread
Root cause: While starting and shutting down the module
we are calling same function update_logging(). While at
the start it is creating listen thread and throwing error
and exiting without closing the listen thread. While
shutdown of module it "should_log" matches with "is_logging"
and it considers cleanup is not required and returns,
leaving Behind the listen thread open. In the next BT ON,
another listen thread is created and causes the crash.
Fix: Started listener thread after prerequisite operations
are successful.
Change-Id: I92ef293d9b061d0ea65a0c41b506870152114bb0