10080 smatch Makefile changes for usr/src/cmd

*** 20,29 ****
--- 20,30 ----
  #
  #
  # Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
  # Copyright 2012 Milan Jurik. All rights reserved.
  # Copyright 2016 Toomas Soome <tsoome@me.com>
+ # Copyright (c) 2018, Joyent, Inc.
  #
  
  PROG = svc.startd
  OBJS = \
          contract.o \
*** 70,79 ****
--- 71,83 ----
  CERRWARN += -_gcc=-Wno-parentheses
  CERRWARN += -_gcc=-Wno-unused-label
  CERRWARN += -_gcc=-Wno-switch
  CERRWARN += -_gcc=-Wno-uninitialized
  
+ # these look like real bugs here, but ...
+ SMOFF += impossible_mask,signed_integer_overflow_check
+ 
  $(OBJS) := CPPFLAGS += -D_FILE_OFFSET_BITS=64 -D_REENTRANT
  
  proc.o := CPPFLAGS += -D_REENTRANT
  
  %.o:    ../common/%.c