tls: rx: simplify async wait

mainline inclusion
from mainline-v5.19-rc1
commit 37943f04
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I92REK
CVE: CVE-2024-26583

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=37943f047bfb88ba4dfc7a522563f57c86d088a0



--------------------------------

Since we are protected from async completions by decrypt_compl_lock
we can drop the async_notify and reinit the completion before we
start waiting.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ziyang Xuan <william.xuanziyang@huawei.com>