templater: drop redundant return in _flatten

mercurial/templater.py

@@ -341,8 +341,6 b' class engine(object):'
         '''Perform expansion. t is name of map element to expand.
         mapping contains added elements for use during expansion. Is a
         generator.'''
-        return _flatten(func(self, mapping, data) for func, data in
-                         self._load(t))
         return _flatten(runtemplate(self, mapping, self._load(t)))
 
 engines = {'default': engine}