avio: flush the internal buffer in avio_close()

This is consistent with stdio, and thus what people would naturally
expect.

libavformat/avio.h

@@ -349,6 +349,9 @@ int avio_open2(AVIOContext **s, const char *url, int flags,
  * Close the resource accessed by the AVIOContext s and free it.
  * This function can only be used if s was opened by avio_open().
  *
+ * The internal buffer is automatically flushed before closing the
+ * resource.
+ *
  * @return 0 on success, an AVERROR < 0 on error.
  */
 int avio_close(AVIOContext *s);

libavformat/aviobuf.c

@@ -761,6 +761,7 @@ int avio_close(AVIOContext *s)
     if (!s)
         return 0;
 
+    avio_flush(s);
     h = s->opaque;
     av_freep(&s->buffer);
     av_free(s);

libavformat/img2enc.c

@@ -86,8 +86,6 @@ static int write_packet(AVFormatContext *s, AVPacket *pkt)
         avio_write(pb[0], pkt->data        , ysize);
         avio_write(pb[1], pkt->data + ysize, (pkt->size - ysize)/2);
         avio_write(pb[2], pkt->data + ysize +(pkt->size - ysize)/2, (pkt->size - ysize)/2);
-        avio_flush(pb[1]);
-        avio_flush(pb[2]);
         avio_close(pb[1]);
         avio_close(pb[2]);
     }else{

libavformat/version.h

@@ -31,7 +31,7 @@
 
 #define LIBAVFORMAT_VERSION_MAJOR 54
 #define LIBAVFORMAT_VERSION_MINOR 16
-#define LIBAVFORMAT_VERSION_MICRO  0
+#define LIBAVFORMAT_VERSION_MICRO  1
 
 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
                                                LIBAVFORMAT_VERSION_MINOR, \