audioflinger: fix deadlock upon AudioRecord creation error

AudioFlinger:openRecord() should not hold mClientLock when
releasing the local reference on AudioRecord as the destructor will
also lock mClientLock.
Same fix for AudioFlinger::createTrack().
Also make sure that AudioFlinger::createEffect() holds mClientLock
when clearing local reference to the Client in case of error.

Regression introduced by 021cf963

Bug: 15118096.
Change-Id: Ie961c398c8e0460bca9b95e2ee4ce6859316c275