10080 smatch Makefile changes for usr/src/cmd

*** 20,30 ****
  #
  #
  # Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  # Copyright (c) 2012, 2016 by Delphix. All rights reserved.
  # Copyright 2017 RackTop Systems.
! #
  
  PROG= ztest
  OBJS= $(PROG).o
  SRCS= $(OBJS:%.o=../%.c)
  
--- 20,30 ----
  #
  #
  # Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  # Copyright (c) 2012, 2016 by Delphix. All rights reserved.
  # Copyright 2017 RackTop Systems.
! # Copyright (c) 2018, Joyent, Inc.
  
  PROG= ztest
  OBJS= $(PROG).o
  SRCS= $(OBJS:%.o=../%.c)
  
*** 55,64 ****
--- 55,67 ----
  LINTFLAGS += -erroff=E_STATIC_UNUSED
  LINTFLAGS64 += -erroff=E_STATIC_UNUSED
  
  CERRWARN += -_gcc=-Wno-switch
  
+ # false positive
+ SMOFF += signed
+ 
  .KEEP_STATE:
  
  all: $(PROG)
  
  $(PROG): $(OBJS)