Make sure F_printk() has corrent format and args, and make sure
changes in F_STRUCT() won't break F_printk().
Signed-off-by: NLi Zefan <lizf@cn.fujitsu.com>
LKML-Reference: <4AADF6CC.1060809@cn.fujitsu.com>
Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>