lighttpd: fix systemd service activation symlink

Signed-off-by: Aurélien Chabot <aurelien@chabot.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/lighttpd/lighttpd.mk

@@ -88,7 +88,7 @@ define LIGHTTPD_INSTALL_INIT_SYSTEMD
 
 	mkdir -p $(TARGET_DIR)/etc/systemd/system/multi-user.target.wants
 
-	ln -fs ../../../../usr/lib/systemd/lighttpd.service \
+	ln -fs ../../../../usr/lib/systemd/system/lighttpd.service \
 		$(TARGET_DIR)/etc/systemd/system/multi-user.target.wants/lighttpd.service
 endef