load_subtree(): separate logic for internal vs. terminal entries

There are only two legitimate notes path components:

* A hexadecimal string that fills the rest of the SHA-1

* A two-digit hexadecimal string that constitutes another internal
  node.

So handle those two cases at the top level, and reject others as
non-notes without trying to parse them. The logic separation also
simplifies upcoming changes.

This prevents us from leaking memory for a leaf_node in the case of
wrong-sized paths. There are still memory leaks in this code; they will
be fixed in upcoming commits.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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