30fafd92c272 ("n_hdlc: simplify freeing of buffer list")
66c3bdf11d9d ("n_hdlc: remove tracing debug prints")
82f2341c94d2 ("tty: n_hdlc: get rid of racy n_hdlc.tbuf")
e9b736d88af1 ("TTY: n_hdlc, fix lockdep false positive")