10079 smatch Makefile changes for usr/src/lib

*** 21,30 ****
--- 21,31 ----
  
  #
  # Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  # Use is subject to license terms.
  #
+ # Copyright (c) 2018, Joyent, Inc.
  
  SHELL=/usr/bin/ksh93
  
  LIBRARY=        libsum.a
  VERS=           .1
*** 74,83 ****
--- 75,86 ----
  CFLAGS64 += \
          $(ASTCFLAGS64)
  
  CERRWARN        += -_gcc=-Wno-parentheses
  
+ SMOFF += all_func_returns
+ 
  # This codepath is performance-critical
  sparc_COPTFLAG=-xO5 -_cc=-xprefetch=auto,explicit
  sparcv9_COPTFLAG=-xO5 -_cc=-xprefetch=auto,explicit
  i386_COPTFLAG=-_cc=-xO5 -_cc=-xprefetch=auto,explicit
  amd64_COPTFLAG=-_cc=-xO5  -_cc=-xprefetch=auto,explicit