In 'hashmap_enable_item_counting()', item is assigned but never
used. This causes a warning on HP NonStop. As the variable is
never used, fix this by just removing it.
Signed-off-by: Randall S. Becker <rsbecker@nexbridge.com> Helped-by: Thomas Gummerer <t.gummerer@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>