11972 resync smatch

*** 19,29 ****
  # CDDL HEADER END
  #
  #
  # Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
  #
! # Copyright (c) 2018, Joyent, Inc.
  
  #
  #       Path to the base of the uts directory tree (usually /usr/src/uts).
  #
  UTSBASE = ../..
--- 19,29 ----
  # CDDL HEADER END
  #
  #
  # Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
  #
! # Copyright 2019 Joyent, Inc.
  
  #
  #       Path to the base of the uts directory tree (usually /usr/src/uts).
  #
  UTSBASE = ../..
*** 65,74 ****
--- 65,77 ----
  CERRWARN        += -_gcc=-Wno-unused-label
  
  # really broken
  SMOFF += logical_instead_of_bitwise,or_vs_and
  
+ # false positive
+ SMOFF += signed
+ 
  #
  #       Default build targets.
  #
  .KEEP_STATE: