syslogd/tests: Amend a test to catch leaked process descriptors

This serves to catch the regression fixed by commit
1a669b66dd ("syslogd: reap pipe children on config reload").

Approved by:	so
Security:	FreeBSD-EN-26:23.syslogd
MFC after:	1 week

(cherry picked from commit 231dfc99a0)
(cherry picked from commit 74c5995d2e)

usr.sbin/syslogd/tests/syslogd_test.sh

@@ -313,6 +313,7 @@ pipe_action_reload_head()
 pipe_action_reload_body()
 {
     local pipecmd="${PWD}/pipe_cmd.sh"
+    local pid
 
     cat <<__EOF__ > "${pipecmd}"
 #!/bin/sh
@@ -329,15 +330,21 @@ __EOF__
     syslogd_start
 
     syslogd_log -p user.debug -t "pipe" -h "${SYSLOGD_LOCAL_SOCKET}" "MSG"
+    sleep 0.1
+
+    pid=$(cat "${SYSLOGD_PIDFILE}")
     atf_check pkill -HUP -F "${1:-${SYSLOGD_PIDFILE}}"
     sleep 0.1
     syslogd_check_log_nopoll "END"
+
+    atf_check -o not-match:"[[:space:]]P[[:space:]]" procstat files "${pid}"
 }
 pipe_action_reload_cleanup()
 {
     syslogd_stop
 }
 
+
 atf_test_case "jail_noinet" "cleanup"
 jail_noinet_head()
 {