ALSA: firewire: Fix -Wformat-truncation warning for longname string

The filling of card->longname can be gracefully truncated, as it's
only informative.  Use scnprintf() and suppress the superfluous
compile warning with -Wformat-truncation.

Link: https://lore.kernel.org/r/20230915082802.28684-11-tiwai@suse.deReviewed-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Tested-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/firewire/fireworks/fireworks.c

@@ -93,11 +93,11 @@ get_hardware_info(struct snd_efw *efw)
 	strcpy(efw->card->driver, "Fireworks");
 	strcpy(efw->card->shortname, hwinfo->model_name);
 	strcpy(efw->card->mixername, hwinfo->model_name);
-	snprintf(efw->card->longname, sizeof(efw->card->longname),
-		 "%s %s v%s, GUID %08x%08x at %s, S%d",
-		 hwinfo->vendor_name, hwinfo->model_name, version,
-		 hwinfo->guid_hi, hwinfo->guid_lo,
-		 dev_name(&efw->unit->device), 100 << fw_dev->max_speed);
+	scnprintf(efw->card->longname, sizeof(efw->card->longname),
+		  "%s %s v%s, GUID %08x%08x at %s, S%d",
+		  hwinfo->vendor_name, hwinfo->model_name, version,
+		  hwinfo->guid_hi, hwinfo->guid_lo,
+		  dev_name(&efw->unit->device), 100 << fw_dev->max_speed);
 
 	if (hwinfo->flags & BIT(FLAG_RESP_ADDR_CHANGABLE))
 		efw->resp_addr_changable = true;

sound/firewire/oxfw/oxfw.c

@@ -108,11 +108,11 @@ static int name_card(struct snd_oxfw *oxfw, const struct ieee1394_device_id *ent
 	strcpy(oxfw->card->mixername, m);
 	strcpy(oxfw->card->shortname, m);
 
-	snprintf(oxfw->card->longname, sizeof(oxfw->card->longname),
-		 "%s %s (OXFW%x %04x), GUID %08x%08x at %s, S%d",
-		 v, m, firmware >> 20, firmware & 0xffff,
-		 fw_dev->config_rom[3], fw_dev->config_rom[4],
-		 dev_name(&oxfw->unit->device), 100 << fw_dev->max_speed);
+	scnprintf(oxfw->card->longname, sizeof(oxfw->card->longname),
+		  "%s %s (OXFW%x %04x), GUID %08x%08x at %s, S%d",
+		  v, m, firmware >> 20, firmware & 0xffff,
+		  fw_dev->config_rom[3], fw_dev->config_rom[4],
+		  dev_name(&oxfw->unit->device), 100 << fw_dev->max_speed);
 end:
 	return err;
 }