ALSA: firewire-motu: constify snd_rawmidi_ops structures

These snd_rawmidi_ops structures are only passed as the third
argument of snd_rawmidi_set_ops.  This argument is const, so the
snd_rawmidi_ops structures can be const too.

Done with the help of Coccinelle.

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Reviewed-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/firewire/motu/motu-midi.c

@@ -128,12 +128,12 @@ static void set_midi_substream_names(struct snd_motu *motu,
 
 int snd_motu_create_midi_devices(struct snd_motu *motu)
 {
-	static struct snd_rawmidi_ops capture_ops = {
+	static const struct snd_rawmidi_ops capture_ops = {
 		.open		= midi_capture_open,
 		.close		= midi_capture_close,
 		.trigger	= midi_capture_trigger,
 	};
-	static struct snd_rawmidi_ops playback_ops = {
+	static const struct snd_rawmidi_ops playback_ops = {
 		.open		= midi_playback_open,
 		.close		= midi_playback_close,
 		.trigger	= midi_playback_trigger,