ALSA: hda/realtek - Fix Oops in alc_mux_select()

commit cce4aa37 upstream.

When no imux is available (e.g. a single capture source),
alc_auto_init_input_src() may trigger an Oops due to the access to -1.
Add a proper zero-check to avoid it.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

sound/pci/hda/patch_realtek.c

@@ -280,6 +280,8 @@ static int alc_mux_select(struct hda_codec *codec, unsigned int adc_idx,
 	imux = &spec->input_mux[mux_idx];
 	if (!imux->num_items && mux_idx > 0)
 		imux = &spec->input_mux[0];
+	if (!imux->num_items)
+		return 0;
 
 	if (idx >= imux->num_items)
 		idx = imux->num_items - 1;