cr_service(): close fd on error

... and don't return -1.

This is a missing part from commit 34772230.
Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

cr-service.c

@@ -400,7 +400,7 @@ int cr_service(bool daemon_mode)
 	if (opts.pidfile) {
 		if (write_pidfile(getpid()) == -1) {
 			pr_perror("Can't write pidfile");
-			return -1;
+			goto err;
 		}
 	}