10080 smatch Makefile changes for usr/src/cmd

*** 19,37 ****
--- 19,40 ----
  # CDDL HEADER END
  #
  # Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  # Use is subject to license terms.
  #
+ # Copyright (c) 2018, Joyent, Inc.
  
  PROG= script
  
  include ../Makefile.cmd
  
  FILEMODE= 0555
  
  CERRWARN += -_gcc=-Wno-unused-variable
  
+ SMOFF += all_func_returns
+ 
  .KEEP_STATE:
  
  all: $(PROG)
  
  install: all $(ROOTPROG)