10688 gfx_private needs smatch fixes

*** 21,30 ****
--- 21,31 ----
  
  #
  # Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
  # Use is subject to license terms.
  # Copyright 2015 Igor Kozhukhov <ikozhukhov@gmail.com>
+ # Copyright 2019, Joyent, Inc.
  #
  
  #
  #       This makefile drives the production of the graphics private
  #       interface kernel module.
*** 67,76 ****
--- 68,80 ----
  LINTTAGS +=     -erroff=E_STATIC_UNUSED
  
  CERRWARN        += -_gcc=-Wno-uninitialized
  CERRWARN        += -_gcc=-Wno-parentheses
  
+ # needs work
+ SMOFF           += all_func_returns,deref_check
+ 
  #
  #       Default build targets.
  #
  .KEEP_STATE: