added a check to avoid starting without the sysctl variables

Added a sysctl control to prevent the system from crashing.
See the bug #1
Signed-off-by: Loic <loic.f@hardenedbsd.org>

etc/rc.d/secadm

@@ -52,7 +52,12 @@ secadm_prestart()
 
 	if [ ! -f ${secadm_rules} ]
 	then
-		echo "missing rules file: ${secadm_rules}"
+		echo "Missing rules file: ${secadm_rules}"
+		return 1
+	fi
+
+	if ! (sysctl -a | egrep -q "kern.features.integriforce|kern.features.secadm") ; then
+		echo "Missing secadm sysctl!"
 		return 1
 	fi