af_unix: fix garbage collect vs MSG_PEEK https://source.android.com/security/bulletin/2021-11-01 https://git.kernel.org/linus/cbcf01128d0a92e131bd09f1688fe032480b65ca CREATE(Triage):(User=admin) CVE-2021-0920 (https://nvd.nist.gov/vuln/detail/CVE-2021-0920)