10080 smatch Makefile changes for usr/src/cmd

*** 21,32 ****
  #
  #
  # Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
  # Use is subject to license terms.
  #
! # ident "%Z%%M% %I%     %E% SMI"
! #
  
  PROG= enhance
  
  include ../Makefile.cmd
  
--- 21,31 ----
  #
  #
  # Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
  # Use is subject to license terms.
  #
! # Copyright (c) 2018, Joyent, Inc.
  
  PROG= enhance
  
  include ../Makefile.cmd
  
*** 39,48 ****
--- 38,49 ----
          -DHAVE_SYS_SELECT_H=1 -DHAVE_SELECT=1 -DHAVE_SYSV_PTY=1 \
          -D__EXTENSIONS__=1
  
  lint := LINTFLAGS += -ux
  
+ SMOFF += all_func_returns
+ 
  .KEEP_STATE:
  
  all: $(PROG)
  
  install: all $(ROOTPROG)