avio: deprecate url_close_buf

It's not used anywhere and its return value looks broken.
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>

libavformat/avio.h

@@ -631,10 +631,10 @@ URLContext *url_fileno(AVIOContext *s);
 attribute_deprecated int url_fget_max_packet_size(AVIOContext *s);
 
 attribute_deprecated int url_open_buf(AVIOContext **s, uint8_t *buf, int buf_size, int flags);
-#endif
 
 /** return the written or read size */
-int url_close_buf(AVIOContext *s);
+attribute_deprecated int url_close_buf(AVIOContext *s);
+#endif
 
 /**
  * Open a write only memory stream.

libavformat/aviobuf.c

@@ -1010,13 +1010,13 @@ int url_open_buf(AVIOContext **s, uint8_t *buf, int buf_size, int flags)
         av_freep(s);
     return ret;
 }
-#endif
 
 int url_close_buf(AVIOContext *s)
 {
     put_flush_packet(s);
     return s->buf_ptr - s->buffer;
 }
+#endif
 
 /* output in a dynamic buffer */