ALSA: usb-audio: sound/usb/endpoint.c: suppress warning

sound/usb/endpoint.c: In function 'queue_pending_output_urbs':
sound/usb/endpoint.c:298: warning: 'packet' may be used uninitialized in this function

Cc: Daniel Mack <zonque@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c
index 12e5a95..83a36d0 100644
--- a/sound/usb/endpoint.c
+++ b/sound/usb/endpoint.c
@@ -295,7 +295,7 @@
 	while (test_bit(EP_FLAG_RUNNING, &ep->flags)) {
 
 		unsigned long flags;
-		struct snd_usb_packet_info *packet;
+		struct snd_usb_packet_info *uninitialized_var(packet);
 		struct snd_urb_ctx *ctx = NULL;
 		struct urb *urb;
 		int err, i;