nvme: reduce checks for zero command effects
For passthrough I/O commands, effects are usually to be zero. nvme_passthrough_end() does three checks in futility for this case. Bail out of function-call/checks. Signed-off-by: NKanchan Joshi <joshi.k@samsung.com> Reviewed-by: NChaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Signed-off-by: NChristoph Hellwig <hch@lst.de>
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