ALSA: hda/ca0132 - make pci_iounmap() call conditional

When building without CONFIG_PCI, we can (depending on the architecture)
get a link failure:

ERROR: "pci_iounmap" [sound/pci/hda/snd-hda-codec-ca0132.ko] undefined!

Adding a compile-time check for PCI gets it to work correctly on
32-bit ARM.

Fixes: d99501b8 ("ALSA: hda/ca0132 - Call pci_iounmap() instead of iounmap()")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/patch_ca0132.c

@@ -8451,7 +8451,7 @@ static void ca0132_free(struct hda_codec *codec)
 	ca0132_exit_chip(codec);
 
 	snd_hda_power_down(codec);
-	if (spec->mem_base)
+	if (IS_ENABLED(CONFIG_PCI) && spec->mem_base)
 		pci_iounmap(codec->bus->pci, spec->mem_base);
 	kfree(spec->spec_init_verbs);
 	kfree(codec->spec);