10138 smatch fixes for usr/src/cmd/sgs

*** 25,35 ****
  /*
   * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
! #pragma ident   "%Z%%M% %I%     %E% SMI"
  
  #include "stdio.h"
  
  extern void exit();
  
--- 25,37 ----
  /*
   * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
! /*
!  * Copyright (c) 2018, Joyent, Inc.
!  */
  
  #include "stdio.h"
  
  extern void exit();
  
*** 38,48 ****
  
  /* ARGSUSED */
  int
  main(int argc, char **argv)
  {
!         yylex();
          exit(0);
  
          /*NOTREACHED*/
          return (0);
  }
--- 40,50 ----
  
  /* ARGSUSED */
  int
  main(int argc, char **argv)
  {
!         (void) yylex();
          exit(0);
  
          /*NOTREACHED*/
          return (0);
  }