ALSA: fireworks/bebob: Change type of argument for sampling rate

Originally, I intent to this argument given with 'struct snd_pcm_runtime.rate'
or params_rate(). They return value of 'unsigned int'. So 'unsigned int' is
better for the type of this argument.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/firewire/bebob/bebob_stream.c b/sound/firewire/bebob/bebob_stream.c
index 452e936..fbe938c 100644
--- a/sound/firewire/bebob/bebob_stream.c
+++ b/sound/firewire/bebob/bebob_stream.c
@@ -483,7 +483,7 @@
 	return err;
 }
 
-int snd_bebob_stream_start_duplex(struct snd_bebob *bebob, int rate)
+int snd_bebob_stream_start_duplex(struct snd_bebob *bebob, unsigned int rate)
 {
 	struct snd_bebob_rate_spec *rate_spec = bebob->spec->rate;
 	struct amdtp_stream *master, *slave;