ALSA: usb-audio: fix comment reference in __uac_clock_find_source

snd_usb_find_clock_source and snd_usb_find_clock_selector are helper
macros that look at an entity id and validate that this entity id is
in fact a clock source or a clock selector. The present comments
inside __uac_clock_find_source give the reader the impression we're
looking for an entity id.

We're looking for an entity id indeed, the clock source, but since
__uac_clock_find_source is recursive, we're also looking *at* the
entity ids, in the search for the one clock source.

Fix the comment so we don't give readers a wrong idea.
Signed-off-by: Geraldo Nascimento <geraldogabriel@gmail.com>
Link: https://lore.kernel.org/r/YU6Kj05oOqRmhJDf@gedaySigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/usb/clock.c

@@ -271,7 +271,7 @@ static int __uac_clock_find_source(struct snd_usb_audio *chip,
 		return -EINVAL;
 	}
 
-	/* first, see if the ID we're looking for is a clock source already */
+	/* first, see if the ID we're looking at is a clock source already */
 	source = snd_usb_find_clock_source(chip, entity_id, proto);
 	if (source) {
 		entity_id = GET_VAL(source, proto, bClockID);
@@ -297,7 +297,7 @@ static int __uac_clock_find_source(struct snd_usb_audio *chip,
 			goto find_source;
 		}
 
-		/* the entity ID we are looking for is a selector.
+		/* the entity ID we are looking at is a selector.
 		 * find out what it currently selects */
 		ret = uac_clock_selector_get_val(chip, clock_id);
 		if (ret < 0) {