ALSA: usb: Constify snd_device_ops definitions

Now we may declare const for snd_device_ops definitions, so let's do
it for optimization.

There should be no functional changes by this patch.

Link: https://lore.kernel.org/r/20200103081714.9560-11-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index 6cd4ff09c5ee60566aae77191fbd73960aa2a79a..f60e0869c096bb2aa2b0b876dbf84dd63c8c776d 100644 (file)
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -3407,7 +3407,7 @@ static int create_keep_iface_ctl(struct usb_mixer_interface *mixer)
 int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif,
                         int ignore_error)
 {
-       static struct snd_device_ops dev_ops = {
+       static const struct snd_device_ops dev_ops = {
                .dev_free = snd_usb_mixer_dev_free
        };
        struct usb_mixer_interface *mixer;