net_uv: Handle failed shutdown req

lib/net_uv.js

@@ -171,6 +171,7 @@ Socket.prototype.end = function(data, encoding) {
     this.writable = false;
     this._flags |= FLAG_SHUTDOWNQUED;
   }
+
   if (!this.writable) return;
   this.writable = false;
 
@@ -182,8 +183,16 @@ Socket.prototype.end = function(data, encoding) {
   } else {
     this._flags |= FLAG_SHUTDOWN;
     var shutdownReq = this._handle.shutdown();
+
+    if (!shutdownReq) {
+      this.destroy(errnoException(errno, 'shutdown'));
+      return false;
+    }
+
     shutdownReq.oncomplete = afterShutdown;
   }
+
+  return true;
 };