10921 mdb_nicenum() needs smatch fix

@@ -24,11 +24,11 @@
 #
 
 #
 # Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
 # Copyright (c) 2012 by Delphix. All rights reserved.
-# Copyright (c) 2012 Joyent, Inc. All rights reserved.
+# Copyright 2019 Joyent, Inc.
 # Copyright 2018 Jason King
 #
 
 .KEEP_STATE:
 .SUFFIXES:

@@ -107,12 +107,10 @@
 CERRWARN += -_gcc=-Wno-clobbered
 CERRWARN += -_gcc=-Wno-parentheses
 CERRWARN += -_gcc=-Wno-unused-label
 CERRWARN += -_gcc=-Wno-unused-variable
 
-SMOFF += all_func_returns
-
 #
 # -erroff=E_INCONS_ARG_DECL2 works around a problem where lint gets confused
 # about how struct mdb_tgt_gregset is used in mdb_tgt_stack_f() and
 # mdb_tgt_stack_iter_f(). Will be resolved as part of fix for CR 6749868.
 #