add the systemd-units in requires

xinetd.spec

@@ -1,7 +1,7 @@
 Name:            xinetd
 Epoch:           2
 Version:         2.3.15
-Release:         28
+Release:         29
 Summary:         A super-server daemon that manages Internet-based connectivity
 License:         xinetd
 URL:             https://github.com/xinetd-org/xinetd
@@ -46,7 +46,8 @@ Patch6005:       sconf.c-fix-possible-memleak.patch
 BuildRequires:   autoconf automake libtirpc-devel libselinux-devel >= 1.30 systemd-units
 Requires:        filesystem >= 2.0.1 setup
 Requires(post):  systemd-sysv systemd-units
-Requires(preun): systemd-units systemd-units
+Requires(preun): systemd-units
+Requires(postun): systemd-units
 Provides:        inetd
 
 %description
@@ -113,5 +114,11 @@ install -m600 contrib/xinetd.d/* %{buildroot}%{_sysconfdir}/xinetd.d
 %exclude %{_mandir}/man8/xconv.pl*
 
 %changelog
+* Tue Dec 24 2019 openEuler Buildteam <buildteam@openeuler.org> - 2:2.3.15-29
+- Type:bugfix
+- ID:NA
+- SUG:NA
+- DESC:add the systemd-units in requires
+
 * Thu Sep 12 2019 huzhiyu<huzhiyu1@huawei.com> - 2:2.3.15-28
 - Package init