ALSA: aloop: Fix PCM format assignment

Fix sparse warnings about PCM format assignment regarding the strong
typed snd_pcm_format_t:
  sound/drivers/aloop.c:352:45: warning: restricted snd_pcm_format_t degrades to integer
  sound/drivers/aloop.c:355:39: warning: incorrect type in assignment (different base types)
  sound/drivers/aloop.c:355:39:    expected unsigned int format
  sound/drivers/aloop.c:355:39:    got restricted snd_pcm_format_t [usertype] format
  sound/drivers/aloop.c:1435:34: warning: incorrect type in assignment (different base types)
  sound/drivers/aloop.c:1435:34:    expected long max
  sound/drivers/aloop.c:1435:34:    got restricted snd_pcm_format_t [usertype]
  sound/drivers/aloop.c:1565:39: warning: incorrect type in assignment (different base types)
  sound/drivers/aloop.c:1565:39:    expected unsigned int format
  sound/drivers/aloop.c:1565:39:    got restricted snd_pcm_format_t [usertype]

Some code in this driver assigns an integer value to snd_pcm_format_t
via control API, and they need to be with the explicit cast.

No functional changes, just sparse warning fixes.

Link: https://lore.kernel.org/r/20200206163945.6797-2-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/drivers/aloop.c

@@ -118,7 +118,7 @@ struct loopback_cable {
 struct loopback_setup {
 	unsigned int notify: 1;
 	unsigned int rate_shift;
-	unsigned int format;
+	snd_pcm_format_t format;
 	unsigned int rate;
 	unsigned int channels;
 	struct snd_ctl_elem_id active_id;
@@ -1432,7 +1432,7 @@ static int loopback_format_info(struct snd_kcontrol *kcontrol,
 	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 	uinfo->count = 1;
 	uinfo->value.integer.min = 0;
-	uinfo->value.integer.max = SNDRV_PCM_FORMAT_LAST;
+	uinfo->value.integer.max = (__force int)SNDRV_PCM_FORMAT_LAST;
 	uinfo->value.integer.step = 1;
 	return 0;
 }                                  
@@ -1443,7 +1443,7 @@ static int loopback_format_get(struct snd_kcontrol *kcontrol,
 	struct loopback *loopback = snd_kcontrol_chip(kcontrol);
 	
 	ucontrol->value.integer.value[0] =
-		loopback->setup[kcontrol->id.subdevice]
+		(__force int)loopback->setup[kcontrol->id.subdevice]
 			       [kcontrol->id.device].format;
 	return 0;
 }