Remove offsetof() from user-visible <linux/stddef.h>

It's not used by anything user-visible, and it make g++ unhappy.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
diff --git a/include/linux/stddef.h b/include/linux/stddef.h
index b3a2cad..ea65dfb 100644
--- a/include/linux/stddef.h
+++ b/include/linux/stddef.h
@@ -10,11 +10,13 @@
 #define NULL ((void *)0)
 #endif
 
+#ifdef __KERNEL__
 #undef offsetof
 #ifdef __compiler_offsetof
 #define offsetof(TYPE,MEMBER) __compiler_offsetof(TYPE,MEMBER)
 #else
 #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
 #endif
+#endif /* __KERNEL__ */
 
 #endif