ALSA: sb8: constify snd_pcm_ops structures

snd_pcm_ops are not supposed to change at runtime. All functions
working with snd_pcm_ops provided by <sound/pcm.h> work with
const snd_pcm_ops. So mark the non-const structs as const.
Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/isa/sb/sb8_main.c

@@ -572,7 +572,7 @@ static int snd_sb8_close(struct snd_pcm_substream *substream)
  *  Initialization part
  */
  
-static struct snd_pcm_ops snd_sb8_playback_ops = {
+static const struct snd_pcm_ops snd_sb8_playback_ops = {
 	.open =			snd_sb8_open,
 	.close =		snd_sb8_close,
 	.ioctl =		snd_pcm_lib_ioctl,
@@ -583,7 +583,7 @@ static struct snd_pcm_ops snd_sb8_playback_ops = {
 	.pointer =		snd_sb8_playback_pointer,
 };
 
-static struct snd_pcm_ops snd_sb8_capture_ops = {
+static const struct snd_pcm_ops snd_sb8_capture_ops = {
 	.open =			snd_sb8_open,
 	.close =		snd_sb8_close,
 	.ioctl =		snd_pcm_lib_ioctl,