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/I5ZI04
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=v6.1-rc3&id=2db96217e7e515071726ca4ec791742c4202a1b2



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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: Zheng Zengkai <zhengzengkai@huawei.com>