crypto: af_alg - Forbid bind(2) when nokey child sockets are present

crypto: af_alg - Forbid bind(2) when nokey child sockets are present

Orabug: 23330755

[ Upstream commit a6a48c565f6f112c6983e2a02b1602189ed6e26e ]

This patch forbids the calling of bind(2) when there are child
sockets created by accept(2) in existence, even if they are created
on the nokey path.

This is needed as those child sockets have references to the tfm
object which bind(2) will destroy.

Cc: stable@vger.kernel.org
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
(cherry picked from commit 8515819fff8fce56be067af985016b6356d1fe5e)

Signed-off-by: Dan Duval <dan.duval@oracle.com>