A missing include in kallsyms.h.

Upstream this is fixed in the 2.6.24 rc series:

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=5a75983eef1193c43caebde6643a218bd8d8390e

Leon Woestenberg <leon.woestenberg@gmail.com>

--- a/include/linux/kallsyms.h
+++ b/include/linux/kallsyms.h
@@ -6,6 +6,7 @@
 #define _LINUX_KALLSYMS_H
 
 #include <linux/errno.h>
+#include <linux/stddef.h>
 
 #define KSYM_NAME_LEN 128
 #define KSYM_SYMBOL_LEN (sizeof("%s+%#lx/%#lx [%s]") + (KSYM_NAME_LEN - 1) + \