ALSA: usb-audio: Fix a limit check in proc_dump_substream_formats()

This should be ARRAY_SIZE() instead of sizeof().  The sizeof() limit is
too high so it doesn't work.

Fixes: 093b8494 ("ALSA: usb-audio: Print more information in stream proc files")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20200422092255.GB195357@mwandaSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/usb/proc.c

@@ -140,7 +140,7 @@ static void proc_dump_substream_formats(struct snd_usb_substream *subs, struct s
 
 			snd_iprintf(buffer, "    Channel map:");
 			for (c = 0; c < map->channels; c++) {
-				if (map->map[c] >= sizeof(channel_labels) ||
+				if (map->map[c] >= ARRAY_SIZE(channel_labels) ||
 				    !channel_labels[map->map[c]])
 					snd_iprintf(buffer, " --");
 				else