OSV-2020-72 Use-of-uninitialized-value in print_crl

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=21153 Crash type: Use-of-uninitialized-value Crash state: printcrl gnutlsx509crlprint gnutlsx509crlparserfuzzer.c...