crypto: engine - check if BH is disabled during completion

[ Upstream commit 4058cf08 ]

When doing iperf over ipsec with crypto hardware sun8i-ce, I hit some
spinlock recursion bug.

This is due to completion function called with enabled BH.

Add check a to detect this.

Fixes: 735d37b5 ("crypto: engine - Introduce the block request crypto engine framework")
Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Stable-dep-of: 4140aafc ("crypto: engine - fix crypto_queue backlog handling")
Signed-off-by: Sasha Levin <sashal@kernel.org>