usbaudio: fix for out->dev->lock remains locked in error case

out->dev->lock remains locked in error case in out_write()
Added pthread_mutex_unlock() in the error case

Bug: 12824374

Change-Id: Id467e3122008eb8128b42dfc0e9103600c1eef2d
Signed-off-by: Glenn Kasten <gkasten@google.com>
1 file changed