tools/accounting/procacct: remove some unused variables

tools/accounting/procacct: remove some unused variables

Drop the following unused variables inherited from getdelays.c:

  'aggr_len', 'len2', 'cmd_type', 'tid', 'containerset', 'containerpath'
  and 'sigset'.

Link: https://lkml.kernel.org/r/20221031091557.192180-1-wangxiongfeng2@huawei.com
Signed-off-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Cc: "Dr. Thomas Orgis" <thomas.orgis@uni-hamburg.de>
Cc: Ismael Luceno <ismael@iodev.co.uk>
Cc: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Cc: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>