10688 gfx_private needs smatch fixes

@@ -21,10 +21,11 @@
 #
 # uts/i86pc/gfx_private/Makefile
 # 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.
 #
 
 #
 #       i86pc platform dependent
 #

@@ -71,10 +72,13 @@
 LINTTAGS        += -erroff=E_ASSIGN_NARROW_CONV
 
 CERRWARN        += -_gcc=-Wno-uninitialized
 CERRWARN        += -_gcc=-Wno-parentheses
 
+# needs work
+SMOFF           += all_func_returns,deref_check
+
 #
 #       Default build targets.
 #
 .KEEP_STATE: