fsmonitor: prefer repo_git_path() to git_pathdup()
The fsmonitor_ipc__get_path() function ignores its repository argument.
It should use it when constructing repo paths (though in practice, it is
unlikely anything but the_repository is ever passed, so this is cleanup
and future proofing, not a bug fix).
Note that despite the lack of "dup" in the name, repo_git_path() behaves
like git_pathdup() and returns an allocated string.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>