From: Seija Kijin <doremylover123@gmail.com>

Use async_exit instead of pthread_exit,
and make async_exit inline.

Functions were reordered
so that this would compile.

Luckily, the order remains consistent.

Signed-off-by: Seija Kijin <doremylover123@gmail.com>

Submitted-As: https://lore.kernel.org/git/pull.1423.git.git.1672768772484.gitgitgadget@gmail.com