flac demux: fix picture leak

modules/demux/flac.c

@@ -182,7 +182,7 @@ static void Close( vlc_object_t * p_this )
 
     int i;
     for( i = 0; i < p_sys->i_attachments; i++ )
-        free( p_sys->attachments[i] );
+        vlc_input_attachment_Delete( p_sys->attachments[i] );
     TAB_CLEAN( p_sys->i_attachments, p_sys->attachments);
 
     /* Delete the decoder */