10077 usr/src/uts/ Makefile changes for smatch

*** 20,30 ****
--- 20,32 ----
  #
  #
  # Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  # Use is subject to license terms.
  #
+ # Copyright (c) 2018, Joyent, Inc.
  
+ 
  #
  #       This makefile drives the production of NS/SiS
  #       Fast Ethernet (SFE) driver module in intel systems
  #
  
*** 76,85 ****
--- 78,90 ----
  CERRWARN        += -_gcc=-Wno-unused-label
  CERRWARN        += -_gcc=-Wno-switch
  CERRWARN        += -_gcc=-Wno-parentheses
  CERRWARN        += -_gcc=-Wno-uninitialized
  
+ # needs work
+ SMOFF += all_func_returns
+ 
  #
  # Driver depends on MAC & IP
  #
  LDFLAGS         += -dy -N misc/mac -N drv/ip