bluez a2dp - destroy thread attr after thread create

Pthread resources may be used by the thread attributes object.
We should destroy this after thread creation.
diff --git a/audio/liba2dp.c b/audio/liba2dp.c
index 5c4ef51..98fd8cd 100755
--- a/audio/liba2dp.c
+++ b/audio/liba2dp.c
@@ -1068,12 +1068,14 @@
 	pthread_cond_signal(&data->thread_wait);
 
 	pthread_mutex_unlock(&data->mutex);
+	pthread_attr_destroy(&attr);
 
 	*dataPtr = data;
 	return 0;
 error:
 	bluetooth_close(data);
 	sbc_finish(&data->sbc);
+	pthread_attr_destroy(&attr);
 	a2dp_free(data);
 
 	return err;