pull up r22636 from trunk

pull up r22636 from trunk
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 r22636 | ghudson | 2009-08-27 09:40:50 -0400 (Thu, 27 Aug 2009) | 17 lines

 ticket: 6551
 subject: Memory leak in spnego accept_sec_context error path
 tags: pullup
 target_version: 1.7

 If the underlying mechanism's accept_sec_context returns an error, the
 spnego accept_sec_context was leaving allocated data in
 *context_handle, which is incorrect for the first call according to
 RFC 2744.

 Fix this by mirroring some code from the spnego init_sec_context,
 which always cleans up the half-constructed context in case of error.
 This is allowed (though not encouraged) by RFC 2744 for second and
 subsequent calls; since we were already doing it in init_sec_context,
 it seems simpler to do that than keep track of whether this is a first
 call or not.

ticket: 6551
version_fixed: 1.7.1
status: resolved

git-svn-id: svn://anonsvn.mit.edu/krb5/branches/krb5-1-7@22813 dc483132-0cff-0310-8789-dd5450dbe970