Fix LWS_NO_SERVER build.

"int n" was used also when server parts are not compiled, so don't put it inside the LWS_NO_SERVER ifdef.
diff --git a/lib/libwebsockets.c b/lib/libwebsockets.c
index a4d352c..80a4ce0 100644
--- a/lib/libwebsockets.c
+++ b/lib/libwebsockets.c
@@ -1626,8 +1626,8 @@
 {
 	struct libwebsocket_context *context = NULL;
 	char *p;
-#ifndef LWS_NO_SERVER
 	int n;
+#ifndef LWS_NO_SERVER
 	int opt = 1;
 	struct libwebsocket *wsi;
 	struct sockaddr_in serv_addr;