crypto: drbg - make drbg_prepare_hrng() handle jent instantiation errors

stable inclusion
from stable-v4.19.283
commit f1943e5703861f89f4376596e3d28d0dd52c5ead
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7BZ5U


CVE: NA

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

[ Upstream commit 559edd47 ]

Now that drbg_prepare_hrng() doesn't do anything but to instantiate a
jitterentropy crypto_rng instance, it looks a little odd to have the
related error handling at its only caller, drbg_instantiate().

Move the handling of jitterentropy allocation failures from
drbg_instantiate() close to the allocation itself in drbg_prepare_hrng().

There is no change in behaviour.

Signed-off-by: Nicolai Stange <nstange@suse.de>
Reviewed-by: Stephan Müller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Stable-dep-of: 686cd976 ("crypto: drbg - Only fail when jent is unavailable in FIPS mode")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Yongqiang Liu <liuyongqiang13@huawei.com>