Fix preuninstall script

Resolves: bz1540934

Signed-off-by: Honggang Li <honli@redhat.com>

opensm.spec

@@ -2,7 +2,7 @@
 
 Name:    opensm
 Version: 3.3.20
-Release: 6%{?dist}
+Release: 7%{?dist}
 Summary: OpenIB InfiniBand Subnet Manager and management utilities
 Group:   System Environment/Daemons
 License: GPLv2 or BSD
@@ -90,17 +90,12 @@ mkdir -p ${RPM_BUILD_ROOT}/var/cache/opensm
 %systemd_post opensm.service
 
 %preun
-# Don't use the macro because we need to remove our cache directory as well
-# and the macro doesn't have the ability to do that.  But, here the macro
-# is for future reference:
-# %systemd_preun opensm.service
-if [ $1 = 0 ]; then
-	/bin/systemctl --no-reload disable opensm.service >/dev/null 2>&1 || :
-	/bin/systemctl stop opensm.service >/dev/null 2>&1 || :
-	rm -fr /var/cache/opensm
-fi
+%systemd_preun opensm.service
 
 %postun
+if [ -d /var/cache/opensm ]; then
+	rm -fr /var/cache/opensm
+fi
 %systemd_postun_with_restart opensm.service
 
 %post libs -p /sbin/ldconfig
@@ -131,6 +126,11 @@ fi
 %{_libdir}/lib*.a
 
 %changelog
+* Thu Feb  1 2018 Honggang Li <honli@redhat.com> - 3.3.20-7
+- Fix BuildRequires
+- Fix preuninstall script
+- Resolves: bz1540934
+
 * Mon Aug 28 2017 Honggang Li <honli@redhat.com> - 3.3.20-6
 - Add support for s309x