10080 smatch Makefile changes for usr/src/cmd

*** 19,28 ****
--- 19,29 ----
  # CDDL HEADER END
  #
  # Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  # Use is subject to license terms.
  #
+ # Copyright (c) 2018, Joyent, Inc.
  
  PROG =          wpad
  MANIFEST =      wpa.xml
  OBJS =          wpa_supplicant.o wpa.o wpa_enc.o eloop.o \
                  driver_wifi.o l2_packet.o
*** 35,44 ****
--- 36,47 ----
  LDLIBS    +=    -ldladm -ldlpi
  all install := LDLIBS += -lcrypto
  
  LINTFLAGS +=    -u
  
+ SMOFF += all_func_returns
+ 
  .KEEP_STATE:
  
  all:            $(PROG)
  
  $(PROG):        $(OBJS)