10080 smatch Makefile changes for usr/src/cmd

*** 20,36 ****
--- 20,39 ----
  #
  #
  # Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
  # Use is subject to license terms.
  #
+ # Copyright (c) 2018, Joyent, Inc.
  
  PROG= regcmp 
  
  include         ../Makefile.cmd
  
  CERRWARN += -_gcc=-Wno-parentheses
  
+ SMOFF += all_func_returns
+ 
  .KEEP_STATE:
  
  all: $(PROG)
  
  install: all $(ROOTPROG) $(ROOTCCSBINLINK)