fix incorrect warning when walking on a particular rev

when a directory was given instead of a file it reported
incorrectly 'No such file or directory in rev <rev>'
we test if the file is a prefix directory

mercurial/localrepo.py

@@ -641,7 +641,11 b' class localrepository(repo.repository):'
         if node:
             fdict = dict.fromkeys(files)
             for fn in self.manifest.read(self.changelog.read(node)[0]):
-                fdict.pop(fn, None)
+                for ffn in fdict:
+                    # match if the file is the exact name or a directory
+                    if ffn == fn or fn.startswith("%s/" % ffn):
+                        del fdict[ffn]
+                        break
                 if match(fn):
                     yield 'm', fn
             for fn in fdict:

tests/test-revert

@@ -85,4 +85,8 b' hg revert -rtip'
 echo % should succeed
 hg revert --all -rtip
 
+echo %% issue332
+hg ci -A -m b -d '1000001 0'
+echo foobar > b/b
+hg revert b
 true

tests/test-revert.out

@@ -58,3 +58,6 b' 1 files updated, 0 files merged, 0 files'
 abort: no files or directories specified
 % should succeed
 reverting a
+%% issue332
+adding b/b
+reverting b/b