fix lxc-info segv on stopped container

src/lxc/lxc_info.c

@@ -124,6 +124,7 @@ int main(int argc, char *argv[])
 
 	if (ips) {
 		char **addresses = c->get_ips(c, NULL, NULL, 0);
+		if (addresses) {
 			char *address;
 			i = 0;
 			while (addresses[i]) {
@@ -132,6 +133,7 @@ int main(int argc, char *argv[])
 				i++;
 			}
 		}
+	}
 
 	for(i = 0; i < keys; i++) {
 		int len = c->get_config_item(c, key[i], NULL, 0);