io_uring: optimise use of ctx->drain_next
Move setting ctx->drain_next to the only place it could be set, when it got linked non-head requests. The same for checking it, it's interesting only for a head of a link or a non-linked request. No functional changes here. This removes some code from the common path and also removes REQ_F_DRAIN_LINK flag, as it doesn't need it anymore. Signed-off-by: NPavel Begunkov <asml.silence@gmail.com> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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