Fix bug introduced in d9a218e

Author: Stephane Landelle

providers/netty/src/main/java/org/asynchttpclient/providers/netty/NettyAsyncHttpProvider.java

@@ -587,7 +587,7 @@ private static HttpRequest construct(AsyncHttpClientConfig config, Request reque
         if (request.getVirtualHost() != null) {
             host = request.getVirtualHost();
         } else {
-            AsyncHttpProviderUtils.getHost(uri);
+            host = AsyncHttpProviderUtils.getHost(uri);
     	}
 
         HttpRequest nettyRequest;