avio: make put_nbyte internal.

Signed-off-by: Ronald S. Bultje <[email protected]>
diff --git a/libavformat/avio_internal.h b/libavformat/avio_internal.h
index 1671537..85e7f06 100644
--- a/libavformat/avio_internal.h
+++ b/libavformat/avio_internal.h
@@ -40,4 +40,6 @@
  */
 int ffio_read_partial(AVIOContext *s, unsigned char *buf, int size);
 
+void ffio_fill(AVIOContext *s, int b, int count);
+
 #endif // AVFORMAT_AVIO_INTERNAL_H