avformat/dvenc: Replace write_trailer by deinit function

The old write_trailer only freed memory, so it is better to make a
dedicated deinit function out of it. Given that this function will also
be called when writing the header fails, one can also remove code that
frees already allocated fifos when allocating another one fails.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavformat/dvenc.c

@@ -364,10 +364,6 @@ static DVMuxContext* dv_init_mux(AVFormatContext* s)
 
     for (i=0; i < c->n_ast; i++) {
         if (c->ast[i] && !(c->audio_data[i]=av_fifo_alloc_array(100, MAX_AUDIO_FRAME_SIZE))) {
-            while (i > 0) {
-                i--;
-                av_fifo_freep(&c->audio_data[i]);
-            }
             goto bail_out;
         }
     }
@@ -378,13 +374,6 @@ bail_out:
     return NULL;
 }
 
-static void dv_delete_mux(DVMuxContext *c)
-{
-    int i;
-    for (i=0; i < c->n_ast; i++)
-        av_fifo_freep(&c->audio_data[i]);
-}
-
 static int dv_write_header(AVFormatContext *s)
 {
     AVRational rate;
@@ -432,10 +421,12 @@ static int dv_write_packet(struct AVFormatContext *s, AVPacket *pkt)
  * Currently we simply drop the last frame. I don't know whether this
  * is the best strategy of all
  */
-static int dv_write_trailer(struct AVFormatContext *s)
+static void dv_deinit(AVFormatContext *s)
 {
-    dv_delete_mux(s->priv_data);
-    return 0;
+    DVMuxContext *c = s->priv_data;
+
+    for (int i = 0; i < c->n_ast; i++)
+        av_fifo_freep(&c->audio_data[i]);
 }
 
 AVOutputFormat ff_dv_muxer = {
@@ -447,5 +438,5 @@ AVOutputFormat ff_dv_muxer = {
     .video_codec       = AV_CODEC_ID_DVVIDEO,
     .write_header      = dv_write_header,
     .write_packet      = dv_write_packet,
-    .write_trailer     = dv_write_trailer,
+    .deinit            = dv_deinit,
 };