git storage: re-organize code to make 'origin' remote more widely available

I'm going to try to update the remote if the local cache is more recent
when we fetch the data, which requires access to the remote over a wider
range of code.  This re-organizes the code so that we can free the
remote later without having to have nasty error handling.

We avoid the whole "if an error happened, free the remote and return" by
creating helper functions and freeing the remote in the caller, so that
all paths end up freeing it naturally.

NOTE! We want to try to update the remote when we save the local cache
too, so this whole "update remote when opening it" is incomplete. But
 (a) we do want to do it here as well
and
 (b) this is the easiest place to create the initial "push to remote"
     code without any new "sync with cloud" interfaces.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

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