Fix bug introduced with revision 1.95 when this filed was modified to

use the new X509_CRL_set_issuer_name() function:
The CRL issuer should be X509_get_subject_name(x509), not
X509_get_issuer_name(x509).

Submitted by: Juergen Lesny <lesnyj@informatik.tu-muenchen.de>

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