Fix undefined behaviour in X509_NAME_cmp()
If the lengths of both names is 0 then don't attempt to do a memcmp. Issue reported by Simon Friedberger, Robert Merget and Juraj Somorovsky. Reviewed-by: NMatthias St. Pierre <Matthias.St.Pierre@ncp-e.com> (Merged from https://github.com/openssl/openssl/pull/6291)
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