exists function fix

src/user.js

@@ -299,14 +299,12 @@ var	config = require('../config.js'),
 	}
 
 
-	User.exists = function(socket, username, callback) {
+	User.exists = function(username, callback) {
 		User.get_uid_by_username(username, function(exists) {
 			exists = !!exists;
 
 			if (callback) 
 				callback(exists);
-			else 
-				socket.emit('user.exists', {exists: exists});
 		});
 	};
 	

src/websockets.js

@@ -124,7 +124,9 @@ var	SocketIO = require('socket.io').listen(global.server,{log:false}),
 		});
 		
 		socket.on('user.exists', function(data) {
-			modules.user.exists(socket, data.username);
+			modules.user.exists(data.username, function(exists){
+				socket.emit('user.exists', {exists: exists});
+			});
 		});
 
 		socket.on('user.count', function(data) {