mesa: Open-code hash walk in _mesa_HashPrint

Previously the deleted key data would get printed at the beginning and
the end.  I don't think that was intentional, so I changed it.

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7171>
1 file changed