(isc_openfile): Don't set scb->mode.

src/libraries/libisc-new/src/isc_session.c

@@ -435,7 +435,6 @@ isc_openfile(IscMaster   * mcb,
       return NULL;
 
   scb->type               = ISC_TYPE_FILE;
-  scb->mode               = openmode;
   scb->info.file.pathname = isc_strdup(pathname);
 
   hcb = isc_newhandler();