ALSA: usx2y: Drop no longer used variable

The recent conversion to the standard print API included some cleanups
and that changed the code no longer referring to a variable iters at
usb_stream_start().  This caused a compiler warning in the end.
Let's drop the unused variable.

Fixes: f8466d91 ("ALSA: usx2y: Use standard print API")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202408090249.8LE9qrae-lkp@intel.com/
Link: https://patch.msgid.link/20240809075700.7320-1-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/usb/usx2y/usb_stream.c

@@ -665,7 +665,7 @@ static void i_playback_start(struct urb *urb)
 int usb_stream_start(struct usb_stream_kernel *sk)
 {
 	struct usb_stream *s = sk->s;
-	int frame = 0, iters = 0;
+	int frame = 0;
 	int u, err;
 	int try = 0;
 
@@ -700,7 +700,6 @@ int usb_stream_start(struct usb_stream_kernel *sk)
 			frame = usb_get_current_frame_number(dev);
 			do {
 				now = usb_get_current_frame_number(dev);
-				++iters;
 			} while (now > -1 && now == frame);
 		}
 		err = usb_submit_urb(inurb, GFP_ATOMIC);