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 2016 OmniTI Computer Consulting, Inc.  All rights reserved.
+ # Copyright (c) 2018, Joyent, Inc.
  #
  # uts/intel/ixgbe/Makefile
  #
  #       This makefile drives the production of the ixgbe
  #       network driver kernel module.
*** 58,67 ****
--- 59,71 ----
  CERRWARN        += -_gcc=-Wno-switch
  CERRWARN        += -_gcc=-Wno-uninitialized
  CERRWARN        += -_gcc=-Wno-unused-value
  CERRWARN        += -_cc=-erroff=E_STATEMENT_NOT_REACHED
  
+ # 3rd party code
+ SMOFF += all_func_returns
+ 
  #
  #       Define targets
  #
  ALL_TARGET      = $(BINARY) $(CONFMOD)
  LINT_TARGET     = $(MODULE).lint