liburing.h: correct max_worker name
liburing.h: correct max_worker name

Fixes: 21916ba39210 ("Change IORING_REGISTER_IOWQ_MAX_UNBOUND_WORKERS")
Signed-off-by: Jens Axboe <cd8c6775e60d6f67a6984377324e5290df3d5358@kernel.dk>

axboe/liburing,axboe/liburing,axboe/liburing