Add missing release_buffer on close

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@20227 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavcodec/4xm.c

@@ -832,6 +832,10 @@ static av_cold int decode_end(AVCodecContext *avctx){
         f->cfrm[i].allocated_size= 0;
     }
     free_vlc(&f->pre_vlc);
+    if(f->current_picture.data[0])
+        avctx->release_buffer(avctx, &f->current_picture);
+    if(f->last_picture.data[0])
+        avctx->release_buffer(avctx, &f->last_picture);
 
     return 0;
 }