aio: all callers of aio_{read,write,fsync,poll} treat 0 and -EIOCBQUEUED the same way
... so just make them return 0 when caller does not need to destroy iocb Reviewed-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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