Fix segfault when deleting an unauthorized element

[Jean-Louis Thekekara]

Dear maintainers,

This patch ensures libtasn1 does not segfault when asked to delete an
unauthorized element (neither optional nor sequence of/set of).

This patch applies on top on my previous submitted patches.

That's the simplest patch I could come up with. But the logic could be
rewritten by testing first value element (instead of testing first type
element). Something like :

if (value == NULL)
  {
    if ((node->type & CONST_OPTION) && (len == 0))
      ...
    else if ((type == ASN1_ETYPE_SEQUENCE_OF || type ==
ASN1_ETYPE_SET_OF) && (len == 0))
      ...
    else
      return ASN1_VALUE_NOT_VALID;
  }

-- 
Jean-Louis Thekekara - OpenWide Ingénierie
http://ingenierie.openwide.fr
http://www.linuxembedded.fr

0001-asn1_write_value-fix-segfault-when-deleting-an-unaut.patch
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