hg annotate: actually annotate the given version

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hg annotate: actually annotate the given version

Bug spotted by Edouard Gomez

manifest hash: 3e29a7a8eb70b92483958ceffe94045a82899c61
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mercurial/hg.py

@@ -42,7 +42,7 b' class filelog(revlog):'
             return new
 
         # find all ancestors
-        needed = {}
+        needed = {node:1}
         visit = [node]
         while visit:
             n = visit.pop(0)