ALSA: hda - Fix auto-mic detection in Realtek codec-parser

A regression fix from commit 21268961d3d1bbdd22a19b68adb80119e8c72dcd
  ALSA: hda - More flexible dynamic-ADC switching for Realtek codecs

The auto-mic wasn't detected properly when no ADC-switch is needed.

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 e230947..371d1e4 100644
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -958,7 +958,7 @@
 				break;
 		}
 		if (i >= imux->num_items)
-			return false; /* no ADC-switch is needed */
+			return true; /* no ADC-switch is needed */
 	}
 
 	for (i = 0; i < imux->num_items; i++) {