[lts-9.2] tty: n_gsm: fix the UAF caused by race condition in gsm_cleanup_mux#269

dvdgomez wants to merge 5 commits intociqlts9_2ctrliq/kernel-src-tree:ciqlts9_2from

dgomez-ciqlts9_2/VULN-676ctrliq/kernel-src-tree:dgomez-ciqlts9_2/VULN-676Copy head branch name to clipboard