minor refactoring

lib/sequelize/model-definition.js

@@ -45,14 +45,15 @@ ModelDefinition.prototype.addDefaultAttributes = function() {
 }
 
 ModelDefinition.prototype.findAutoIncrementField = function() {
-  var self = this;
-  this.autoIncrementField = null;
+  var self = this
+
+  this.autoIncrementField = null
   Utils._.map(this.attributes, function(definition, name) {
-    if (definition && definition.indexOf('auto_increment') >= 0) {
-      if (self.autoIncrementField) {
+    if (definition && (definition.indexOf('auto_increment') > -1)) {
+      if (self.autoIncrementField)
         throw new Error('Invalid model definition. Only one autoincrement field allowed.')
-      }
-      self.autoIncrementField = name;
+      else
+        self.autoIncrementField = name
     }
   })
 }