[ruby/openssl] pkcs7: only set error_string in the error path

Set the error_string attribute to nil if PKCS7_verify() succeeds, since
the error queue should be empty in that case.

With AWS-LC, OpenSSL::PKCS#verify currently sets error_string to
"invalid library (0)" when the verification succeeds, whereas with
OpenSSL and LibreSSL, it becomes nil. ERR_reason_error_string() appears
to behave differently when an invalid error code is passed.

The branch to raise OpenSSL::PKCS7::PKCS7Error is removed because it
does not appear to be reachable.

https://github.com/ruby/openssl/commit/c11c6631fa

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