blktrace: remove unnessary stop block trace in 'blk_trace_shutdown'

mainline inclusion
from mainline-v6.1-rc2
commit 2db96217
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5Z7DK


CVE: NA

--------------------------------

As previous commit, 'blk_trace_cleanup' will stop block trace if
block trace's state is 'Blktrace_running'.
So remove unnessary stop block trace in 'blk_trace_shutdown'.

Signed-off-by: Ye Bin <yebin10@huawei.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20221019033602.752383-4-yebin@huaweicloud.com


Signed-off-by: Jens Axboe <axboe@kernel.dk>

conflicts:
kernel/trace/blktrace.c

Signed-off-by: Ye Bin <yebin10@huawei.com>
Reviewed-by: Jason Yan <yanaijie@huawei.com>
Signed-off-by: Yongqiang Liu <liuyongqiang13@huawei.com>