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2976 remove useless offsetof() macros

@@ -21,19 +21,18 @@
 /*
  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  */
 
-#pragma ident   "%Z%%M% %I%     %E% SMI"
-
 #include <meta.h>
 #include <assert.h>
 #include <ctype.h>
 #include <mdiox.h>
 #include <meta.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <stddef.h>
 #include <strings.h>
 #include <sys/lvm/md_mddb.h>
 #include <sys/lvm/md_names.h>
 #include <sys/lvm/md_crc.h>
 #include <sys/lvm/md_convert.h>

@@ -159,11 +158,10 @@
  * MAXSIZEMDRECNAME is the value that has historically been used to allocate
  * space for the metadevice name
  */
 #define MAXSIZEMDRECNAME        20
 #define NAMEWIDTH               16
-#define offsetof(s, m)  ((size_t)(&(((s *)0)->m)))
 #define NOT_PHYSICAL_DEV        0
 #define PHYSICAL_DEV            1
 
 
 /*