Check for 0 modulus in BN_RECP_CTX_set.

Check for 0 modulus in BN_RECP_CTX_set.

The function BN_RECP_CTX_set did not check whether arg d is zero,
in which case an early failure should be returned to the invoker.
This is a similar fix to the cognate defect of CVE-2015-1794.

Fixes #21111

CLA: trivial

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/21255)

(cherry picked from commit 43596b306b1fe06da3b1a99e07c0cf235898010d)