11422 ztest needs smatch flag

@@ -20,11 +20,11 @@
 #
 #
 # Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
 # Copyright (c) 2012, 2016 by Delphix. All rights reserved.
 # Copyright 2017 RackTop Systems.
-# Copyright 2019, Joyent, Inc.
+# Copyright 2019 Joyent, Inc.
 
 PROG= ztest
 OBJS= $(PROG).o
 SRCS= $(OBJS:%.o=../%.c)
 

@@ -58,10 +58,13 @@
 CERRWARN += -_gcc=-Wno-switch
 
 # false positive
 SMOFF += signed
 
+# needs work
+SMOFF += all_func_returns
+
 .KEEP_STATE:
 
 all: $(PROG)
 
 $(PROG): $(OBJS)