10077 usr/src/uts/ Makefile changes for smatch

*** 20,29 ****
--- 20,30 ----
  #
  #
  # Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  # Use is subject to license terms.
  #
+ # Copyright (c) 2018, Joyent, Inc.
  
  #
  # This makefile drives the production of the atu driver kernel module.
  #
  # i86pc architecture dependent
*** 59,68 ****
--- 60,72 ----
  #
  LDFLAGS         += -dy -Nmisc/mac -Nmisc/net80211 -Nmisc/usba
  
  CERRWARN        += -_gcc=-Wno-switch
  
+ # needs work
+ $(OBJS_DIR)/atu.o := SMOFF += all_func_returns
+ 
  #
  #       Default build targets.
  #
  .KEEP_STATE: