crypto: af_alg - Fix regression on empty requests

mainline inclusion
from mainline-v5.9-rc1
commit 662bb52f
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I991GQ
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=662bb52f50bca16a74fe92b487a14d7dccb85e1a



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Some user-space programs rely on crypto requests that have no
control metadata.  This broke when a check was added to require
the presence of control metadata with the ctx->init flag.

This patch fixes the regression by setting ctx->init as long as
one sendmsg(2) has been made, with or without a control message.

Reported-by: Sachin Sant <sachinp@linux.vnet.ibm.com>
Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Fixes: f3c802a1 ("crypto: algif_aead - Only wake up when...")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: GUO Zihua <guozihua@huawei.com>