largefiles: fix update from a merge with removed files
A situation with this case could happen after interrupting an update. Update
would fail with:
abort: No such file or directory: $TESTTMP/f/.hglf/sub2/large6
Update from a merge without using clean is not possible anyway, so this patch
takes a step in the right direction so it gets as far as reporting the right
error.
Mercurial
=========
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