10080 smatch Makefile changes for usr/src/cmd

*** 19,36 ****
--- 19,39 ----
  # CDDL HEADER END
  #
  # Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  # Use is subject to license terms.
  #
+ # Copyright (c) 2018, Joyent, Inc.
  
  PROG=   strace strerr strclean
  
  include ../../Makefile.cmd
  
  CFLAGS += $(CCVERBOSE)
  CERRWARN += -_gcc=-Wno-unused-variable
  
+ SMOFF += all_func_returns
+ 
  FILEMODE= 0555
  
  .KEEP_STATE:
  
  all: $(PROG)