Compare with the right git sha when deciding nothing has changed

The saved_git_id could be updated in is_git_repository() under certain
circumstances, so we need to make sure we compare to the sha that was
current as we entered this function. Since the pointer is just to a static
buffer we need to actually copy it (and then free it later).

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

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