10075 make usr/src/tools smatch clean

@@ -20,10 +20,11 @@
 #
 #
 # Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
 # Use is subject to license terms.
 #
+# Copyright (c) 2018, Joyent, Inc.
 
 include ../../../Makefile.tools
 
 #
 # A `make install' from the tools directory needs to work, even if the rest of

@@ -44,5 +45,7 @@
         -I$(NATIVE_ADJUNCT)/include
 
 CPPFLAGS += $(HDRDIRS)
 CFLAGS += $(CCVERBOSE)
 CERRWARN += -_gcc=-Wno-parentheses
+
+SMOFF += all_func_returns