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fsmonitor: don't attempt state-leave if we didn't state-enter

The state-enter command may not have been successful; for example, the watchman
client session may have timed out if the user was busy/idle for a long period
during a merge conflict resolution earlier in processing a rebase for a stack
of diffs.

It's cleaner (from the perspective of the watchman logs) to avoid issuing the
state-leave command in these cases.

Test Plan:
ran

`hg rebase --tool :merge -r '(draft() & date(-14)) - master::' -d master`

and didn't observe any errors in the watchman logs or in the output from

`watchman -p -j <<<'["subscribe", "/data/users/wez/fbsource", "wez", {"expression": ["name", ".hg/updatestate"]}]'`

Mercurial
=========

Mercurial is a fast, easy to use, distributed revision control tool
for software developers.

Basic install:

 $ make            # see install targets
 $ make install    # do a system-wide install
 $ hg debuginstall # sanity-check setup
 $ hg              # see help

Running without installing:

 $ make local      # build for inplace usage
 $ ./hg --version  # should show the latest version

See https://mercurial-scm.org/ for detailed installation
instructions, platform-specific notes, and Mercurial user information.