Fix memory leak in load_key_certs_crls() when using stdin.

Fix memory leak in load_key_certs_crls() when using stdin.

A newly created BIO object within this function calls
OSSL_STORE_attach() which increases the ref count to 2.
OSSL_STORE_close() then decrements the ref count by 1, so the BIO still
remains.

The following new test was picking up this leak using..
> valgrind openssl crl -hash -noout < test/testcrl.pem

Not quite sure why the existing tests were not picking this up
since they appear to run through a similiar path.. such as
> valgrind openssl pkey < test-runs/test_rsa/rsa-pkcs8-ff.dd

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/15058)