Really _call_ method revlog.count in revlog.lookup()

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Really _call_ method revlog.count in revlog.lookup()
This fixes e.g. 'hg export 398737777' (exists in the mercurial repo).

manifest hash: 9de9ad4c40d0746cb3db346a01c373e3b4aba54a
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mercurial/revlog.py

@@ -195,7 +195,7 b' class revlog:'
             rev = int(id)
             if str(rev) != id: raise ValueError
             if rev < 0: rev = self.count() + rev
-            if rev < 0 or rev >= self.count: raise ValueError
+            if rev < 0 or rev >= self.count(): raise ValueError
             return self.node(rev)
         except (ValueError, OverflowError):
             c = []