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gssapi: fix memory leak of output token in multi round context #1733
When multiple rounds are needed to establish a security context
(detached from PR #1687)
When multiple rounds are needed to establish a security context (usually ntlm), we overwrite old token with a new one without free. Found by proposed gss tests using stub a gss implementation (by valgrind error), though I have confirmed the leak with a real gssapi implementation as well.