MEDIUM: threads/fd: Initialize the process mask during the call to fd_insert

Listeners will allow any threads to process the corresponding fd. But for other
FDs, we limit the processing to the current thread.
diff --git a/src/proto_uxst.c b/src/proto_uxst.c
index 4210f5d..fc4a519 100644
--- a/src/proto_uxst.c
+++ b/src/proto_uxst.c
@@ -332,9 +332,9 @@
 	listener->state = LI_LISTEN;
 
 	/* the function for the accept() event */
-	fd_insert(fd);
 	fdtab[fd].iocb = listener->proto->accept;
 	fdtab[fd].owner = listener; /* reference the listener instead of a task */
+	fd_insert(fd, MAX_THREADS_MASK);
 	return err;
 
  err_rename: