Commit 
eaa9b3a748539651f50e3a234c8854e1b42a839a introduced the following
uninitialized warning:
	sound/pci/hda/patch_realtek.c: In function 'set_capture_mixer':
	sound/pci/hda/patch_realtek.c:4928: warning: 'pin' is used uninitialized in this function
	sound/pci/hda/patch_realtek.c:4918: note: 'pin' was declared here
It appears indeed that 'pin' needs to be initialized to 0.
Signed-off-by: Frederik Deweerdt <frederik.deweerdt@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
 
 static void fixup_single_adc(struct hda_codec *codec)
 {
        struct alc_spec *spec = codec->spec;
-       hda_nid_t pin;
+       hda_nid_t pin = 0;
        int i;
 
        /* search for the input pin; there must be only one */