largefiles: avoid infinite recursive call of openlfdirstate in overriderevert

When there isn't lfdirstate file in cases below, "openlfdirstate()"
call "scmutil.match()" indirectly to build lfdirstate up.

  - subrepos disabling largefiles locally
  - lfdirstate file is missed accidentally

This causes infinite recursive call of "openlfdirstate()" in
"overriderevert()" (introduced by 79c2c29c71ae), because
"openlfdirstate()" is invoked from the function overriding
"scmutil.match()" itself.

To avoid infinite recursive call of "openlfdirstate()" in
"overriderevert()" in such cases, this patch passes "create=False"
argument to "openlfdirstate()".

"create=False" forcibly makes "openlfdirstate()" avoid code path to
build lfdirstate up.

hgext/largefiles/overrides.py

@@ -721,7 +721,7 b' def overriderevert(orig, ui, repo, *pats'
             # currently doesn't work correctly in that case, this match is
             # called, so the lfdirstate above may not be the correct one for
             # this invocation of match.
-            lfdirstate = lfutil.openlfdirstate(ctx._repo.ui, ctx._repo)
+            lfdirstate = lfutil.openlfdirstate(ctx._repo.ui, ctx._repo, False)
 
             def tostandin(f):
                 if lfutil.standin(f) in ctx: