Merge branch 'signal_safety' of https://github.com/crrodriguez/util-linux

* 'signal_safety' of https://github.com/crrodriguez/util-linux:
  sulogin: only assign to variables written by signal handlers
  hardlink: calling putchar is off-limits on a signal handler
  hardlink: last_signal should be a volatile sig_atomic_t
  pg: calling exit on signal handler is not allowed
  lib:pager: fix signal safety issues
  write: signal_received should be volatile qualified
  flock: timeout_expired must be volatile qualified
  last: should not use errx/warnx on signal handlers
  su-common: bool is a distinct type in c2x
  fsck: only assign to cancel_requested
  fsck: use sig_atomic_t type fot signal handler global vars

diff --cc login-utils/last.c
Simple merge