block: fix warning on compile with CONFIG_BLOCK
struct io_context was not defined, just add an empty forward decl.
Signed-off-by: NJens Axboe <jens.axboe@oracle.com>
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struct io_context was not defined, just add an empty forward decl.
Signed-off-by: NJens Axboe <jens.axboe@oracle.com>