ksmbd: fix mechToken leak when SPNEGO decode fails after token alloc

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CVE-2026-31610

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix mechToken leak when SPNEGO decode fails after token alloc The kernel ASN.1 BER decoder calls action callbacks incrementally as it walks the input. When ksmbddecodenegTokenInit reaches the mechToken 2 OCTET STRING...