block: fix returnvar.cocci warnings
Remove unneeded variable used to store return value. Generated by: scripts/coccinelle/misc/returnvar.cocci Signed-off-by: NFengguang Wu <fengguang.wu@intel.com> Signed-off-by: NJulia Lawall <julia.lawall@lip6.fr> Signed-off-by: NJens Axboe <axboe@fb.com>
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