block: add missed trace_block_plug
After flush plug list, the list has no request, so we need to add a trace_block_plug(). Signed-off-by: NShaohua Li <shaohua.li@intel.com> Reviewed-by: NNamhyung Kim <namhyung@gmail.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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