receive-pack: remove unnecessary run_status report

receive-pack: remove unnecessary run_status report

The function run_status was used to report failures after a hook was run.
By now, the only thing that the function itself reported was the exit code
of the hook (if it was non-zero). But this is redundant because it can be
expected that the hook itself will have reported a suitable error.

Signed-off-by: Johannes Sixt <j6t@kdbg.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>