mxfenc: fix memleaks in mxf_write_footer

Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
Reviewed-by: tomas.hardin@codemill.se
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/mxfenc.c

@@ -2400,7 +2400,7 @@ static int mxf_write_footer(AVFormatContext *s)
 {
     MXFContext *mxf = s->priv_data;
     AVIOContext *pb = s->pb;
-    int err;
+    int err = 0;
 
     mxf->duration = mxf->last_indexed_edit_unit + mxf->edit_units_count;
 
@@ -2408,10 +2408,10 @@ static int mxf_write_footer(AVFormatContext *s)
     mxf->footer_partition_offset = avio_tell(pb);
     if (mxf->edit_unit_byte_count && s->oformat != &ff_mxf_opatom_muxer) { // no need to repeat index
         if ((err = mxf_write_partition(s, 0, 0, footer_partition_key, 0)) < 0)
-            return err;
+            goto end;
     } else {
         if ((err = mxf_write_partition(s, 0, 2, footer_partition_key, 0)) < 0)
-            return err;
+            goto end;
         mxf_write_klv_fill(s);
         mxf_write_index_table_segment(s);
     }
@@ -2424,21 +2424,22 @@ static int mxf_write_footer(AVFormatContext *s)
             /* rewrite body partition to update lengths */
             avio_seek(pb, mxf->body_partition_offset[0], SEEK_SET);
             if ((err = mxf_write_opatom_body_partition(s)) < 0)
-                return err;
+                goto end;
         }
 
         avio_seek(pb, 0, SEEK_SET);
         if (mxf->edit_unit_byte_count && s->oformat != &ff_mxf_opatom_muxer) {
             if ((err = mxf_write_partition(s, 1, 2, header_closed_partition_key, 1)) < 0)
-                return err;
+                goto end;
             mxf_write_klv_fill(s);
             mxf_write_index_table_segment(s);
         } else {
             if ((err = mxf_write_partition(s, 0, 0, header_closed_partition_key, 1)) < 0)
-                return err;
+                goto end;
         }
     }
 
+end:
     ff_audio_interleave_close(s);
 
     av_freep(&mxf->index_entries);
@@ -2448,7 +2449,7 @@ static int mxf_write_footer(AVFormatContext *s)
 
     mxf_free(s);
 
-    return 0;
+    return err < 0 ? err : 0;
 }
 
 static int mxf_interleave_get_packet(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)