ALSA: lola - Make SRC helper global

Make lola_sample_rate_convert() global so that it can be accessed from
other files.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/lola/lola.h b/sound/pci/lola/lola.h
index 4734c7c..23831a1 100644
--- a/sound/pci/lola/lola.h
+++ b/sound/pci/lola/lola.h
@@ -499,6 +499,7 @@
 int lola_set_clock(struct lola *chip, int idx);
 int lola_set_sample_rate(struct lola *chip, int rate);
 bool lola_update_ext_clock_freq(struct lola *chip, unsigned int val);
+unsigned int lola_sample_rate_convert(unsigned int coded);
 
 /* mixer */
 int lola_init_pins(struct lola *chip, int dir, int *nidp);