fix #590 (#1591)

packages/busybox/crontab.c.patch

@@ -14,3 +14,13 @@ diff -u -r ../busybox-1.22.1/miscutils/crontab.c ./miscutils/crontab.c
  	ptr = getenv("VISUAL");
  	if (!ptr) {
  		ptr = getenv("EDITOR");
+@@ -168,7 +168,8 @@
+ 		}
+ 		close_on_exec_on(src_fd); /* don't want editor to see this fd */
+ 		edit_file(pas, tmp_fname);
+-		/* fall through */
++        xrename(tmp_fname, pas->pw_name);
++        break;
+ 
+ 	case 0: /* Replace (no -l, -e, or -r were given) */
+ 		new_fname = xasprintf("%s.new", pas->pw_name);