10077 usr/src/uts/ Makefile changes for smatch

*** 20,29 ****
--- 20,30 ----
  #
  #
  # 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 the Broadcom BCM57xx
  #       Gigabit Ethernet (BGE) driver module in intel systems
  #
*** 68,77 ****
--- 69,81 ----
  CERRWARN        += -_gcc=-Wno-switch
  CERRWARN        += -_gcc=-Wno-parentheses
  CERRWARN       += -_gcc=-Wno-unused-variable
  CERRWARN       += -_gcc=-Wno-unused-function
  
+ # 3rd party source
+ SMOFF += all_func_returns
+ 
  #
  # Driver depends on MAC
  #
  LDFLAGS         += -dy -N misc/mac