Re: Fix zero-object version-2 packs

Linus Torvalds [off-list ref] writes:

A pack-file can get created without any objects in it (to transfer "no 
data" - which can happen if you use a reference git repo, for example, 
or just otherwise just end up transferring only branch head information 
and already have all the objects themselves).

And while we probably should never create an index for such a pack, if we 
do (and we do), the index file size sanity checking was incorrect.

This fixes it.

Reported-and-tested-by: Jocke Tjernlund <redacted>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Tjernlund [off-list ref] wrote:

quoted

[SNIP patch]

Tested your patch and the error went away, many thanks

Thank you very much to both of you.  Will be in 'maint'.