10076 make usr/src/test smatch clean

*** 10,19 ****
--- 10,20 ----
  #
  
  #
  # Copyright (c) 2012 by Delphix. All rights reserved.
  # Copyright 2017 Gordon W. Ross
+ # Copyright (c) 2018, Joyent, Inc.
  #
  
  include $(SRC)/cmd/Makefile.cmd
  include $(SRC)/test/Makefile.com
  
*** 23,32 ****
--- 24,36 ----
  
  LDLIBS += -lsocket
  CSTD = $(CSTD_GNU99)
  CPPFLAGS += -D_XOPEN_SOURCE=600 -D__EXTENSIONS__
  
+ # needs work
+ SMOFF += all_func_returns
+ 
  nosignal := LDLIBS += -lnsl
  nosignal.ln := LDLIBS += -lnsl
  
  ROOTOPTPKG = $(ROOT)/opt/os-tests
  TESTDIR = $(ROOTOPTPKG)/tests/sockfs