dgram: defer send error to next tick

lib/dgram.js

@@ -189,7 +189,10 @@ Socket.prototype.send = function(buffer,
       }
       else {
         // don't emit as error, dgram_legacy.js compatibility
-        callback(errnoException(errno, 'send'));
+        var err = errnoException(errno, 'send');
+        process.nextTick(function() {
+          callback(err);
+        });
       }
     }
   });