sound/oss: use current->state helpers

Call __set_current_state() instead of assigning the new state directly.
These interfaces also aid CONFIG_DEBUG_ATOMIC_SLEEP environments, keeping
track of who changed the state.

Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/oss/swarm_cs4297a.c b/sound/oss/swarm_cs4297a.c
index a33e8ce..213a416 100644
--- a/sound/oss/swarm_cs4297a.c
+++ b/sound/oss/swarm_cs4297a.c
@@ -1654,7 +1654,7 @@
         s->dma_dac.hwptr = s->dma_dac.swptr = hwptr;
         spin_unlock_irqrestore(&s->lock, flags);
 	remove_wait_queue(&s->dma_dac.wait, &wait);
-	current->state = TASK_RUNNING;
+	__set_current_state(TASK_RUNNING);
 	return 0;
 }