staging: csr: remove CsrOffSetOf()

It's really just offsetof, so call that instead.

Cc: Mikko Virkkilä <mikko.virkkila@bluegiga.com>
Cc: Lauri Hintsala <Lauri.Hintsala@bluegiga.com>
Cc: Riku Mettälä <riku.mettala@bluegiga.com>
Cc: Veli-Pekka Peltola <veli-pekka.peltola@bluegiga.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/csr/csr_util.h

@@ -9,19 +9,8 @@
             on the license terms.
 
 *****************************************************************************/
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 #include <linux/kernel.h>
 #include <linux/types.h>
 #include "csr_macro.h"
 
-#define CsrOffsetOf(st, m)  ((size_t) & ((st *) 0)->m)
-
-#ifdef __cplusplus
-}
-#endif
-
 #endif