10079 smatch Makefile changes for usr/src/lib

*** 19,29 ****
  # CDDL HEADER END
  #
  #
  # Copyright (c) 2006, 2010, Oracle and/or its affiliates. All rights reserved.
  #
! #
  
  LIBRARY =       libmapid.a
  VERS    =       .1
  SMF_DIR =       $(SRC)/cmd/fs.d/nfs/lib
  
--- 19,29 ----
  # CDDL HEADER END
  #
  #
  # Copyright (c) 2006, 2010, Oracle and/or its affiliates. All rights reserved.
  #
! # Copyright (c) 2018, Joyent, Inc.
  
  LIBRARY =       libmapid.a
  VERS    =       .1
  SMF_DIR =       $(SRC)/cmd/fs.d/nfs/lib
  
*** 56,65 ****
--- 56,67 ----
  
  CERRWARN +=     -_gcc=-Wno-switch
  CERRWARN +=     -_gcc=-Wno-unused-variable
  CERRWARN +=     -_gcc=-Wno-uninitialized
  
+ SMOFF += all_func_returns
+ 
  .KEEP_STATE:
  
  all:  $(LIBS)
  
  install: $(ROOTLIBDIR) all