ALSA: pcm: Constify the list in snd_pcm_hw_constraint_list

Allows the constraint lists to be declared const by drivers which seems
reasonable; there's plenty of other constification we could do if we were
being complete but this was easy and quick.

Signed-off-by: Mark Brown <[e-mail]>
Signed-off-by: Takashi Iwai <[e-mail]>

include/sound/pcm.h

···
 
 struct snd_pcm_hw_constraint_list {
 	unsigned int count;
-	unsigned int *list;
+	const unsigned int *list;
 	unsigned int mask;
 };
 
···
 			  unsigned int k, struct snd_interval *c);
 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
 			  const struct snd_interval *b, struct snd_interval *c);
-int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask);
+int snd_interval_list(struct snd_interval *i, unsigned int count,
+		      const unsigned int *list, unsigned int mask);
 int snd_interval_ratnum(struct snd_interval *i,
 			unsigned int rats_count, struct snd_ratnum *rats,
 			unsigned int *nump, unsigned int *denp);

sound/core/pcm_lib.c

···
  *
  * Returns non-zero if the value is changed, zero if not changed.
  */
-int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask)
+int snd_interval_list(struct snd_interval *i, unsigned int count,
+		      const unsigned int *list, unsigned int mask)
 {
         unsigned int k;
 	struct snd_interval list_range;