ALSA: pci/korg1212: remove 'set but not used' warnings

Fix W=1 warnings. Two variables are only used for debug logs, mark
with __maybe_unused:

sound/pci/korg1212/korg1212.c: In function ‘snd_korg1212_create’:
sound/pci/korg1212/korg1212.c:2152:36: warning: variable ‘iomem2_size’
set but not used [-Wunused-but-set-variable]
2152 | unsigned ioport_size, iomem_size, iomem2_size;
| ^~~~~~~~~~~
sound/pci/korg1212/korg1212.c:2152:11: warning: variable ‘ioport_size’
set but not used [-Wunused-but-set-variable]
2152 | unsigned ioport_size, iomem_size, iomem2_size;
| ^~~~~~~~~~~

Signed-off-by: Pierre-Louis Bossart <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Takashi Iwai <[e-mail]>

sound/pci/korg1212/korg1212.c

···
 {
         int err, rc;
         unsigned int i;
-	unsigned ioport_size, iomem_size, iomem2_size;
+	unsigned iomem_size;
+	__maybe_unused unsigned ioport_size;
+	__maybe_unused unsigned iomem2_size;
         struct snd_korg1212 * korg1212;
 	const struct firmware *dsp_code;