ALSA: usb-audio: endpoint : remove needless check before usb_free_coherent()

usb_free_coherent() is safe with NULL addr and this check is
not required.

Signed-off-by: Xu Wang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Takashi Iwai <[email protected]>

Author: ISCAS-Vulab

sound/usb/endpoint.c

@@ -615,9 +615,8 @@ static void release_urbs(struct snd_usb_endpoint *ep, int force)
 	for (i = 0; i < ep->nurbs; i++)
 		release_urb_ctx(&ep->urb[i]);
 
-	if (ep->syncbuf)
-		usb_free_coherent(ep->chip->dev, SYNC_URBS * 4,
-				  ep->syncbuf, ep->sync_dma);
+	usb_free_coherent(ep->chip->dev, SYNC_URBS * 4,
+			  ep->syncbuf, ep->sync_dma);
 
 	ep->syncbuf = NULL;
 	ep->nurbs = 0;