rnbd-srv: make process_msg_close returns void
Change the return type to void given it always returns 0. Signed-off-by: Guoqing Jiang <guoqing.jiang@linux.dev> Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com> Acked-by: Md Haris Iqbal <haris.iqbal@ionos.com> Link: https://lore.kernel.org/r/20220902100055.25724-3-guoqing.jiang@linux.dev Signed-off-by: Jens Axboe <axboe@kernel.dk>
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