ALSA: pci/asihpi: remove 'set but not used' warnings

Fix W=1 warnings by removing 2 unnecessary initializations and
removing a variable that's not used.

sound/pci/asihpi/asihpi.c: In function ‘snd_asihpi_tuner_band_get’:
sound/pci/asihpi/asihpi.c:1907:6: warning: variable ‘num_bands’ set
but not used [-Wunused-but-set-variable]
 1907 |  u32 num_bands = 0;
      |      ^~~~~~~~~
sound/pci/asihpi/asihpi.c: In function ‘snd_asihpi_tuner_band_put’:
sound/pci/asihpi/asihpi.c:1934:6: warning: variable ‘num_bands’ set
 but not used [-Wunused-but-set-variable]
 1934 |  u32 num_bands = 0;
      |      ^~~~~~~~~
sound/pci/asihpi/asihpi.c: In function ‘snd_asihpi_mux_info’:
sound/pci/asihpi/asihpi.c:2164:6: warning: variable ‘err’ set but not
 used [-Wunused-but-set-variable]
 2164 |  int err;
      |      ^~~
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20200702193604.169059-4-pierre-louis.bossart@linux.intel.comSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/asihpi/asihpi.c

@@ -1904,7 +1904,7 @@ static int snd_asihpi_tuner_band_get(struct snd_kcontrol *kcontrol,
 	*/
 	u16 band, idx;
 	u16 tuner_bands[HPI_TUNER_BAND_LAST];
-	u32 num_bands = 0;
+	u32 num_bands;
 
 	num_bands = asihpi_tuner_band_query(kcontrol, tuner_bands,
 				HPI_TUNER_BAND_LAST);
@@ -1931,7 +1931,7 @@ static int snd_asihpi_tuner_band_put(struct snd_kcontrol *kcontrol,
 	unsigned int idx;
 	u16 band;
 	u16 tuner_bands[HPI_TUNER_BAND_LAST];
-	u32 num_bands = 0;
+	u32 num_bands;
 
 	num_bands = asihpi_tuner_band_query(kcontrol, tuner_bands,
 			HPI_TUNER_BAND_LAST);
@@ -2161,7 +2161,6 @@ static int snd_card_asihpi_mux_count_sources(struct snd_kcontrol *snd_control)
 static int snd_asihpi_mux_info(struct snd_kcontrol *kcontrol,
 			       struct snd_ctl_elem_info *uinfo)
 {
-	int err;
 	u16 src_node_type, src_node_index;
 	u32 h_control = kcontrol->private_value;
 
@@ -2174,7 +2173,6 @@ static int snd_asihpi_mux_info(struct snd_kcontrol *kcontrol,
 		uinfo->value.enumerated.item =
 		    uinfo->value.enumerated.items - 1;
 
-	err =
 	hpi_multiplexer_query_source(h_control,
 				     uinfo->value.enumerated.item,
 				     &src_node_type, &src_node_index);