I got a problem when doing attachments (C-c C-a c/m/c). My *Messages*
buffer is flooded with:

  "fatal: pathspec 'x' did not match any files"

messages. This is because the `split-string' function call in
`org-attach-commit' does not split correctly in my emacs version
(23.1.92.1).

Maybe other emacs versions split by NULL-characters when SEPARATORS is
the empty string but mine does not so I suggest the attached change.

It fixes this problem for me and is also correcting two other typos
found when recompiling.

Patch is against the current git head.