10080 smatch Makefile changes for usr/src/cmd

@@ -20,17 +20,20 @@
 #
 #
 # Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
 # Use is subject to license terms.
 #
+# Copyright (c) 2018, Joyent, Inc.
 
 PROG= regcmp 
 
 include         ../Makefile.cmd
 
 CERRWARN += -_gcc=-Wno-parentheses
 
+SMOFF += all_func_returns
+
 .KEEP_STATE:
 
 all: $(PROG)
 
 install: all $(ROOTPROG) $(ROOTCCSBINLINK)