ALSA: hdspm - Refactor serial number to avoid code duplication

The serial number is used multiple times in hdspm.c. Since it belongs
to the card, let's store it in struct hdspm and refer to it whenever
necessary.
Signed-off-by: Adrian Knoth <adi@drcomp.erfurt.thur.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/rme9652/hdspm.c

@@ -941,6 +941,8 @@ struct hdspm {
 
 	cycles_t last_interrupt;
 
+	unsigned int serial;
+
 	struct hdspm_peak_rms peak_rms;
 };
 
@@ -4694,7 +4696,7 @@ snd_hdspm_proc_read_madi(struct snd_info_entry * entry,
 
 	snd_iprintf(buffer, "HW Serial: 0x%06x%06x\n",
 			(hdspm_read(hdspm, HDSPM_midiStatusIn1)>>8) & 0xFFFFFF,
-			(hdspm_read(hdspm, HDSPM_midiStatusIn0)>>8) & 0xFFFFFF);
+			hdspm->serial);
 
 	snd_iprintf(buffer, "IRQ: %d Registers bus: 0x%lx VM: 0x%lx\n",
 			hdspm->irq, hdspm->port, (unsigned long)hdspm->iobase);
@@ -6266,8 +6268,7 @@ static int snd_hdspm_hwdep_ioctl(struct snd_hwdep *hw, struct file *file,
 		hdspm_version.card_type = hdspm->io_type;
 		strncpy(hdspm_version.cardname, hdspm->card_name,
 				sizeof(hdspm_version.cardname));
-		hdspm_version.serial = (hdspm_read(hdspm,
-					HDSPM_midiStatusIn0)>>8) & 0xFFFFFF;
+		hdspm_version.serial = hdspm->serial;
 		hdspm_version.firmware_rev = hdspm->firmware_rev;
 		hdspm_version.addons = 0;
 		if (hdspm->tco)
@@ -6866,12 +6867,14 @@ static int __devinit snd_hdspm_probe(struct pci_dev *pci,
 	}
 
 	if (hdspm->io_type != MADIface) {
+		hdspm->serial = (hdspm_read(hdspm,
+				HDSPM_midiStatusIn0)>>8) & 0xFFFFFF;
 		sprintf(card->shortname, "%s_%x",
 			hdspm->card_name,
-			(hdspm_read(hdspm, HDSPM_midiStatusIn0)>>8) & 0xFFFFFF);
+			hdspm->serial);
 		sprintf(card->longname, "%s S/N 0x%x at 0x%lx, irq %d",
 			hdspm->card_name,
-			(hdspm_read(hdspm, HDSPM_midiStatusIn0)>>8) & 0xFFFFFF,
+			hdspm->serial,
 			hdspm->port, hdspm->irq);
 	} else {
 		sprintf(card->shortname, "%s", hdspm->card_name);