ALSA: hda - Add a warning for ignored pins with ALC259/268/269

The current ALC259/268/269 parser ignores some pins as unhandled,
but user won't notice what goes wrong.  So, added a warning message
for the ignored pins as a hint.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
index ce6c3a9..49c04fc 100644
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -13164,6 +13164,8 @@
 		dac = 0x03;
 		break;
 	default:
+		snd_printd(KERN_WARNING "hda_codec: "
+			   "ignoring pin 0x%x as unknown\n", nid);
 		return 0;
 	}
 	if (spec->multiout.dac_nids[0] != dac &&