Fix type checking

lib/Doctrine/DBAL/Event/SchemaDropTableEventArgs.php

@@ -54,12 +54,11 @@ class SchemaDropTableEventArgs extends SchemaEventArgs
      */
     public function __construct($table, AbstractPlatform $platform)
     {
-        if ($table instanceof Table || is_string($table)) {
-            $this->_table = $table;
-        } else {
+        if (!$table instanceof Table && !is_string($table)) {
             throw new \InvalidArgumentException('SchemaCreateTableEventArgs expects $table parameter to be string or \Doctrine\DBAL\Schema\Table.');
         }
 
+        $this->_table    = $table;
         $this->_platform = $platform;
     }