Don't call ossl_provider_free() without first setting refcnt

Don't call ossl_provider_free() without first setting refcnt

The function ossl_provider_free() decrements the refcnt of the
provider and frees it if it has reached 0. This only works if the
refcnt has already been initialised. We must only call
ossl_provider_free() after this initialisation - otherwise it will fail
to free the provider correctly.

Addresses the issue mentioned here:
https://github.com/openssl/openssl/pull/18355#issuecomment-1138741857

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/18417)