10079 smatch Makefile changes for usr/src/lib

*** 20,29 ****
--- 20,30 ----
  #
  
  #
  # Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
  #
+ # Copyright (c) 2018, Joyent, Inc.
  
  LIBRARY = libsmp.a
  VERS = .1
  
  OBJECTS = \
*** 42,51 ****
--- 43,54 ----
  CFLAGS += $(CCVERBOSE)
  
  CERRWARN += -_gcc=-Wno-type-limits
  CERRWARN += -_gcc=-Wno-uninitialized
  
+ SMOFF += all_func_returns
+ 
  LDLIBS += \
          -lumem \
          -lc
  LIBS =          $(DYNLIB) $(LINTLIB)
  ROOTLIBDIR =    $(ROOTSCSILIBDIR)