Fix setsebool log message with selinux disabled

This is cosmetic fix, that's prevent execution of setsebool
during ypbind service start when selinux is disabled.

As a result invalid boolean message should not occur in logs anymore:

systemd[1]: Starting NIS/YP (Network Information Service) Clients to NIS Domain Binder...
setsebool[1581714]: Could not change active booleans: Invalid boolean

Resolves: #1882069

ypbind.service

@@ -13,7 +13,7 @@ NotifyAccess=all
 EnvironmentFile=-/etc/sysconfig/network
 EnvironmentFile=-/etc/sysconfig/ypbind
 ExecStartPre=/usr/libexec/ypbind-pre-setdomain
-ExecStartPre=-/usr/sbin/setsebool allow_ypbind=1 
+ExecStartPre=-/bin/bash -c 'selinuxenabled && /usr/sbin/setsebool allow_ypbind=1'
 ExecStart=/usr/sbin/ypbind -n $OTHER_YPBIND_OPTS
 ExecStartPost=/usr/libexec/ypbind-post-waitbind
 PrivateTmp=true

ypbind.spec

@@ -2,7 +2,7 @@ Summary: The NIS daemon which binds NIS clients to an NIS domain
 Name: ypbind
 Epoch: 3
 Version: 2.7.2
-Release: 5%{?dist}
+Release: 6%{?dist}
 License: GPLv2
 Source0: https://github.com/thkukuk/ypbind-mt/archive/v%{version}.tar.gz#/ypbind-mt-%{version}.tar.gz
 Url: http://www.linux-nis.org/nis/ypbind-mt/index.html
@@ -109,6 +109,9 @@ install -m 755 %{SOURCE5} $RPM_BUILD_ROOT%{_libexecdir}/ypbind-post-waitbind
 %license COPYING
 
 %changelog
+* Tue Sep 28 2021 Marek Kulik <mkulik@redhat.com> - 3:2.7.2-6
+- Fix setsebool message in logs, resolves: #1882069
+
 * Fri Jul 23 2021 Fedora Release Engineering <releng@fedoraproject.org> - 3:2.7.2-5
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_35_Mass_Rebuild