11972 resync smatch

@@ -19,11 +19,12 @@
 # CDDL HEADER END
 #
 #
 # Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
 #
-# Copyright (c) 2018, Joyent, Inc.
+# Copyright 2019 Joyent, Inc.
+#
 
 
 #
 #       Path to the base of the uts directory tree (usually /usr/src/uts).
 #

@@ -66,10 +67,13 @@
 CERRWARN        += -_gcc=-Wno-unused-variable
 
 # needs work
 $(OBJS_DIR)/sol_cma.o := SMOFF += deref_check
 
+# false positive
+SMOFF += signed
+
 #
 #       Default build targets.
 #
 .KEEP_STATE: