ALSA: oxfw: use const qualifier for immutable argument

In the helper function, the first argument is immutable, thus it is
preferable to use const qualifier.
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20240218074128.95210-2-o-takashi@sakamocchi.jpSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/firewire/oxfw/oxfw-stream.c

@@ -515,7 +515,7 @@ int snd_oxfw_stream_get_current_formation(struct snd_oxfw *oxfw,
  * in AV/C Stream Format Information Specification 1.1 (Apr 2005, 1394TA)
  * Also 'Clause 12 AM824 sequence adaption layers' in IEC 61883-6:2005
  */
-int snd_oxfw_stream_parse_format(u8 *format,
+int snd_oxfw_stream_parse_format(const u8 *format,
 				 struct snd_oxfw_stream_formation *formation)
 {
 	unsigned int i, e, channels, type;

sound/firewire/oxfw/oxfw.h

@@ -136,7 +136,7 @@ struct snd_oxfw_stream_formation {
 	unsigned int pcm;
 	unsigned int midi;
 };
-int snd_oxfw_stream_parse_format(u8 *format,
+int snd_oxfw_stream_parse_format(const u8 *format,
 				 struct snd_oxfw_stream_formation *formation);
 int snd_oxfw_stream_get_current_formation(struct snd_oxfw *oxfw,
 				enum avc_general_plug_dir dir,