monitor: Clean up after previous commit Inline qmp_call_cmd() along with its helper handler_audit() into its only caller handle_qmp_command(), and simplify the result. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>