10079 smatch Makefile changes for usr/src/lib

*** 20,29 ****
--- 20,30 ----
  #
  #
  # Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  # Use is subject to license terms.
  #
+ # Copyright (c) 2018, Joyent, Inc.
  
  LIBRARY = libinetutil.a
  VERS =    .1
  OBJECTS = octet.o inetutil.o ifspec.o ifaddrlist.o ifaddrlistx.o eh.o tq.o
  
*** 46,55 ****
--- 47,58 ----
  CFLAGS +=       $(CCVERBOSE)
  CPPFLAGS +=     -I$(SRCDIR)
  
  CERRWARN +=     -_gcc=-Wno-parentheses
  
+ SMOFF += index_overflow
+ 
  .KEEP_STATE:
  
  all: $(LIBS)
  
  lint: lintcheck