match: drop optimization (?) of 'parentdirs' calculation

It seems unlikely that the optimization to avoid calling util.finddirs
twice will be noticeable, so let's drop it. This makes the two
conditions for includes and regular patterns more similar.

mercurial/match.py

@@ -224,19 +224,18 b' class match(object):'
         '''
         if dir in self._excluderoots:
             return False
-        parentdirs = None
         if (self._includeroots and
             dir not in self._includeroots and
             dir not in self._includedirs):
-            parentdirs = list(util.finddirs(dir))
-            if not any(parent in self._includeroots for parent in parentdirs):
+            if not any(parent in self._includeroots
+                       for parent in util.finddirs(dir)):
                 return False
         return (not self._fileroots or
                 '.' in self._fileroots or
                 dir in self._fileroots or
                 dir in self._dirs or
                 any(parentdir in self._fileroots
-                    for parentdir in parentdirs or util.finddirs(dir)))
+                    for parentdir in util.finddirs(dir)))
 
     def exact(self, f):
         '''Returns True if f is in .files().'''