audio: use size_t where makes sense

Signed-off-by: Kővágó, Zoltán <DirtY.iCE.hu@gmail.com>
Message-id: c5193e687fc6cc0f60cb3e90fe69ddf2027d0df1.1566168923.git.DirtY.iCE.hu@gmail.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
diff --git a/audio/rate_template.h b/audio/rate_template.h
index 6e93588..f94c940 100644
--- a/audio/rate_template.h
+++ b/audio/rate_template.h
@@ -28,7 +28,7 @@
  * Return number of samples processed.
  */
 void NAME (void *opaque, struct st_sample *ibuf, struct st_sample *obuf,
-           int *isamp, int *osamp)
+           size_t *isamp, size_t *osamp)
 {
     struct rate *rate = opaque;
     struct st_sample *istart, *iend;