ALSA: hdspm: Fix typo arbitary

Fix comment typo.
s/arbitary/arbitrary/
Signed-off-by: Naoki Hayama <naoki.hayama@lineo.co.jp>
Link: https://lore.kernel.org/r/e04a8c5b-8c59-3f02-34d3-c1a871d08cc2@lineo.co.jpSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/rme9652/hdspm.c

@@ -1217,7 +1217,7 @@ static int snd_hdspm_use_is_exclusive(struct hdspm *hdspm)
 	return ret;
 }
 
-/* round arbitary sample rates to commonly known rates */
+/* round arbitrary sample rates to commonly known rates */
 static int hdspm_round_frequency(int rate)
 {
 	if (rate < 38050)