test/connect: fixup a few style issues
test/connect: fixup a few style issues

Also, the liburing helpers return -errno, not -1/errno. The usage
of io_uring_submit_and_wait() was wrong, fix it.

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

axboe/liburing,axboe/liburing,axboe/liburing