Remove typeof comparing to undefined

This comparison is invalid, because typeof always returns strings.

Author: hodovani

lib/validate.js

@@ -168,11 +168,11 @@ var validate = exports._validate = function(/*Any*/instance,/*Object*/schema,/*O
 				if(schema.minLength && typeof value == 'string' && value.length < schema.minLength){
 					addError("must be at least " + schema.minLength + " characters long");
 				}
-				if(typeof schema.minimum !== undefined && typeof value == typeof schema.minimum &&
+				if(typeof schema.minimum !== 'undefined' && typeof value == typeof schema.minimum &&
 						schema.minimum > value){
 					addError("must have a minimum value of " + schema.minimum);
 				}
-				if(typeof schema.maximum !== undefined && typeof value == typeof schema.maximum &&
+				if(typeof schema.maximum !== 'undefined' && typeof value == typeof schema.maximum &&
 						schema.maximum < value){
 					addError("must have a maximum value of " + schema.maximum);
 				}