ALSA: usb-audio: correct the value cache check.

The check of cval->cached should be zero-based (including master channel).

Signed-off-by: Yao-Wen Mao <yaowen@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 1 insertions, 1 deletions

diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index fd5c49e94867..f494dced3c11 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -2540,7 +2540,7 @@ static int restore_mixer_value(struct usb_mixer_elem_list *list)
                 for (c = 0; c < MAX_CHANNELS; c++) {
                         if (!(cval->cmask & (1 << c)))
                                 continue;
-                        if (cval->cached & (1 << c)) {
+                        if (cval->cached & (1 << (c + 1))) {
                                 err = snd_usb_set_cur_mix_value(cval, c + 1, idx,
                                                         cval->cache_val[idx]);
                                 if (err < 0)