10076 make usr/src/test smatch clean

*** 8,17 ****
--- 8,18 ----
  # source.  A copy of the CDDL is also available via the Internet at
  # http://www.illumos.org/license/CDDL.
  #
  
  # Copyright 2016, Richard Lowe.
+ # Copyright (c) 2018, Joyent, Inc.
  
  include $(SRC)/Makefile.master
  include $(SRC)/Makefile.master.64
  include $(SRC)/cmd/Makefile.cmd
  include $(SRC)/cmd/Makefile.cmd.64
*** 22,31 ****
--- 23,35 ----
  
  PROGS= select_test
  
  CSTD= $(CSTD_GNU99)
  
+ # needs work
+ SMOFF += all_func_returns
+ 
  select_test: select_test.c
          $(LINK64.c) -o $@ select_test.c $(LDLIBS64)
          $(POST_PROCESS)
  
  SCRIPTS=select.sh