test/sq-poll-share: don't close file until we're done
test/sq-poll-share: don't close file until we're done

Easy to get spurious -EBADF if we do.

Signed-off-by: Jens Axboe <cd8c6775e60d6f67a6984377324e5290df3d5358@kernel.dk>

axboe/liburing,axboe/liburing,axboe/liburing