avformat: remove unneeded avio_flush() calls from the end of write_trailer functions

The IO context is always flushed by libavformat/mux.c after write_trailer is
called, so this change should have no effect at all.

libavformat/aiffenc.c

@@ -263,8 +263,6 @@ static int aiff_write_trailer(AVFormatContext *s)
         file_size = avio_tell(pb);
         avio_seek(pb, aiff->form, SEEK_SET);
         avio_wb32(pb, file_size - aiff->form - 4);
-
-        avio_flush(pb);
     }
 
     return ret;

libavformat/astenc.c

@@ -178,7 +178,6 @@ static int ast_write_trailer(AVFormatContext *s)
         }
 
         avio_seek(pb, file_size, SEEK_SET);
-        avio_flush(pb);
     }
     return 0;
 }

libavformat/au.c

@@ -326,7 +326,6 @@ static int au_write_trailer(AVFormatContext *s)
         avio_seek(pb, 8, SEEK_SET);
         avio_wb32(pb, (uint32_t)(file_size - au->header_size));
         avio_seek(pb, file_size, SEEK_SET);
-        avio_flush(pb);
     }
 
     return 0;

libavformat/cafenc.c

@@ -258,7 +258,6 @@ static int caf_write_trailer(AVFormatContext *s)
             avio_write(pb, caf->pkt_sizes, caf->size_entries_used);
             caf->size_buffer_size = 0;
         }
-        avio_flush(pb);
     }
     av_freep(&caf->pkt_sizes);
     return 0;

libavformat/flacenc.c

@@ -349,7 +349,6 @@ static int flac_write_trailer(struct AVFormatContext *s)
         avio_seek(pb, 8, SEEK_SET);
         avio_write(pb, streaminfo, FLAC_STREAMINFO_SIZE);
         avio_seek(pb, file_size, SEEK_SET);
-        avio_flush(pb);
     } else {
         av_log(s, AV_LOG_WARNING, "unable to rewrite FLAC header.\n");
     }

libavformat/hashenc.c

@@ -152,7 +152,6 @@ static int hash_write_trailer(struct AVFormatContext *s)
         av_hash_final_hex(c->hashes[i], buf + strlen(buf), sizeof(buf) - strlen(buf));
         av_strlcatf(buf, sizeof(buf), "\n");
         avio_write(s->pb, buf, strlen(buf));
-        avio_flush(s->pb);
     }
 
     return 0;

libavformat/mmf.c

@@ -171,8 +171,6 @@ static int mmf_write_trailer(AVFormatContext *s)
         avio_write(pb, "\x00\x00\x00\x00", 4);
 
         avio_seek(pb, pos, SEEK_SET);
-
-        avio_flush(pb);
     }
     return 0;
 }

libavformat/mpegenc.c

@@ -1244,7 +1244,6 @@ static int mpeg_mux_end(AVFormatContext *ctx)
      * it as it is usually not needed by decoders and because it
      * complicates MPEG stream concatenation. */
     // avio_wb32(ctx->pb, ISO_11172_END_CODE);
-    // avio_flush(ctx->pb);
 
     for (i = 0; i < ctx->nb_streams; i++) {
         stream = ctx->streams[i]->priv_data;

libavformat/soxenc.c

@@ -99,8 +99,6 @@ static int sox_write_trailer(AVFormatContext *s)
         } else
             avio_wb64(pb, num_samples);
         avio_seek(pb, file_size, SEEK_SET);
-
-        avio_flush(pb);
     }
 
     return 0;

libavformat/ttaenc.c

@@ -154,7 +154,6 @@ static int tta_write_trailer(AVFormatContext *s)
     tta_queue_flush(s);
 
     ff_ape_write_tag(s);
-    avio_flush(s->pb);
 
     return 0;
 }

libavformat/vc1testenc.c

@@ -76,7 +76,6 @@ static int vc1test_write_trailer(AVFormatContext *s)
     if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
         avio_seek(pb, 0, SEEK_SET);
         avio_wl24(pb, ctx->frames);
-        avio_flush(pb);
     }
     return 0;
 }

libavformat/wavenc.c

@@ -478,7 +478,6 @@ static int wav_write_trailer(AVFormatContext *s)
             avio_wl32(pb, -1);
 
             avio_seek(pb, file_size, SEEK_SET);
-            avio_flush(pb);
         }
     }
 
@@ -605,7 +604,6 @@ static int w64_write_trailer(AVFormatContext *s)
         }
 
         avio_seek(pb, file_size, SEEK_SET);
-        avio_flush(pb);
     }
 
     return 0;

libavformat/wtvenc.c

@@ -823,8 +823,6 @@ static int write_trailer(AVFormatContext *s)
     avio_seek(pb, 0x5c, SEEK_SET);
     avio_wl32(pb, file_end_pos >> WTV_SECTOR_BITS);
 
-    avio_flush(pb);
-
     av_free(wctx->sp_pairs);
     av_free(wctx->st_pairs);
     av_packet_unref(&wctx->thumbnail);