net: tls: factor out tls_*crypt_async_wait()

mainline inclusion
from mainline-v6.8-rc5
commit c57ca512f3b68ddcd62bda9cc24a8f5584ab01b1
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=c57ca512f3b68ddcd62bda9cc24a8f5584ab01b1



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

Factor out waiting for async encrypt and decrypt to finish.
There are already multiple copies and a subsequent fix will
need more. No functional changes.

Note that crypto_wait_req() returns wait->err

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Reviewed-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Conflicts:
	net/tls/tls_sw.c
Signed-off-by: Ziyang Xuan <william.xuanziyang@huawei.com>