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External USB camera hal service crashes when disconnecting the camera. ExternalCameraDeviceSession's desctructor is called and deletes mLock, but mBufferRequestThread is still running and waiting on the same mLock, which causes the "pthread_mutex_lock called on a destroyed mutex" error. Fix the issue by stopping the thread in destructor. Also refactors the functions and remove unused conditions. Bug: 289741662 Test: Test with USB camera Change-Id: I06b1ff6e192a4bca16822785d65d68a6aae53414