11972 resync smatch

@@ -19,11 +19,11 @@
 # 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).
 #
 UTSBASE = ../..

@@ -65,10 +65,13 @@
 CERRWARN        += -_gcc=-Wno-unused-label
 
 # really broken
 SMOFF += logical_instead_of_bitwise,or_vs_and
 
+# false positive
+SMOFF += signed
+
 #
 #       Default build targets.
 #
 .KEEP_STATE: