ALSA: firewire: 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/firewire/isight.c

@@ -444,7 +444,7 @@ static snd_pcm_uframes_t isight_pointer(struct snd_pcm_substream *substream)
 
 static int isight_create_pcm(struct isight *isight)
 {
-	static struct snd_pcm_ops ops = {
+	static const struct snd_pcm_ops ops = {
 		.open      = isight_open,
 		.close     = isight_close,
 		.ioctl     = snd_pcm_lib_ioctl,

sound/firewire/motu/motu-pcm.c

@@ -352,7 +352,7 @@ static int playback_ack(struct snd_pcm_substream *substream)
 
 int snd_motu_create_pcm_devices(struct snd_motu *motu)
 {
-	static struct snd_pcm_ops capture_ops = {
+	static const struct snd_pcm_ops capture_ops = {
 		.open      = pcm_open,
 		.close     = pcm_close,
 		.ioctl     = snd_pcm_lib_ioctl,
@@ -365,7 +365,7 @@ int snd_motu_create_pcm_devices(struct snd_motu *motu)
 		.page      = snd_pcm_lib_get_vmalloc_page,
 		.mmap      = snd_pcm_lib_mmap_vmalloc,
 	};
-	static struct snd_pcm_ops playback_ops = {
+	static const struct snd_pcm_ops playback_ops = {
 		.open      = pcm_open,
 		.close     = pcm_close,
 		.ioctl     = snd_pcm_lib_ioctl,