Fix init script (#3057)

git-svn-id: svn://svn.openwrt.org/openwrt/packages@10520 3c298f89-4303-0410-b956-a3cf2f4a3e73

net/dhcp/files/dhcpd.init

@@ -15,7 +15,7 @@ start() {
 	
 	/usr/sbin/dhcpd -q -cf $config_file -lf $lease_file
 	
-	if [ $$ -eq 0 ]; then
+	if [ $? -eq 0 ]; then
 		echo "  isc-dhcpd failed to start"
 	fi
 }
@@ -25,7 +25,7 @@ stop() {
 	if [ -e $pid_file ]; then
 		kill `cat $pid_file`
 
-		if [ $$ -eq 0 ]; then
+		if [ $? -eq 0 ]; then
 			echo "  PID " `cat $pid_file` not found
 			echo "  Is the DHCP server running?"
 		fi