ALSA: usb-audio: simplify snd_usb_endpoint_start/stop arguments

Reduce the redundant arguments for snd_usb_endpoint_start() and
snd_usb_endpoint_stop().  Also replaced from int to bool.

No functional changes by this commit.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/usb/endpoint.h b/sound/usb/endpoint.h
index 3d4c970..f1e451d 100644
--- a/sound/usb/endpoint.h
+++ b/sound/usb/endpoint.h
@@ -16,9 +16,8 @@
 				struct audioformat *fmt,
 				struct snd_usb_endpoint *sync_ep);
 
-int  snd_usb_endpoint_start(struct snd_usb_endpoint *ep, int can_sleep);
-void snd_usb_endpoint_stop(struct snd_usb_endpoint *ep,
-			   int force, int can_sleep, int wait);
+int  snd_usb_endpoint_start(struct snd_usb_endpoint *ep, bool can_sleep);
+void snd_usb_endpoint_stop(struct snd_usb_endpoint *ep, bool wait);
 void snd_usb_endpoint_sync_pending_stop(struct snd_usb_endpoint *ep);
 int  snd_usb_endpoint_activate(struct snd_usb_endpoint *ep);
 int  snd_usb_endpoint_deactivate(struct snd_usb_endpoint *ep);