Fix syntax error

Author: mdboom

pyperformance/_benchmark.py

@@ -168,7 +168,7 @@ def extra_opts(self):
     def setup_py(self):
         if not self._get_metadata_value('install_setup', False):
             return None
-        filename = os.path.join(os.path.dirname(self.metafile), 'setup.py'))
+        filename = os.path.join(os.path.dirname(self.metafile), 'setup.py')
         return filename if os.path.exists(filename) else None
 
     # Other metadata keys: