10080 smatch Makefile changes for usr/src/cmd

*** 20,29 ****
--- 20,30 ----
  #
  #
  # Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  # Use is subject to license terms.
  #
+ # Copyright (c) 2018, Joyent, Inc.
  
  PROG = vmstat
  OBJS = vmstat.o
  SRCS =$(OBJS:%.o=%.c) $(COMMON_SRCS)
  
*** 33,42 ****
--- 34,46 ----
  LDLIBS += -ldevinfo -lkstat -lavl
  CFLAGS += $(CCVERBOSE) -I${STATCOMMONDIR}
  CERRWARN += -_gcc=-Wno-switch
  CERRWARN += -_gcc=-Wno-uninitialized
  CERRWARN += -_gcc=-Wno-parentheses
+ 
+ SMOFF += signed
+ 
  FILEMODE= 0555
  
  lint := LINTFLAGS = -muxs -I$(STATCOMMONDIR)
  
  .KEEP_STATE: