ALSA: ice1724 - External clock item only for cards with SPDIF_IN

Append the external clock item to the clock list only if
the SPDIF_IN capability is defined in the SPDIF register.
Signed-off-by: Pavel Hofman <pavel.hofman@ivitera.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/ice1712/ice1724.c

@@ -1825,7 +1825,12 @@ static int snd_vt1724_pro_internal_clock_info(struct snd_kcontrol *kcontrol,
 	uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
 	uinfo->count = 1;
 
-	uinfo->value.enumerated.items = hw_rates_count + ice->ext_clock_count;
+	/* internal clocks */
+	uinfo->value.enumerated.items = hw_rates_count;
+	/* external clocks */
+	if (ice->force_rdma1 ||
+	    (ice->eeprom.data[ICE_EEP2_SPDIF] & VT1724_CFG_SPDIF_IN))
+		uinfo->value.enumerated.items += ice->ext_clock_count;
 	/* upper limit - keep at top */
 	if (uinfo->value.enumerated.item >= uinfo->value.enumerated.items)
 		uinfo->value.enumerated.item = uinfo->value.enumerated.items - 1;