Every time we cat stack_trace, we leak memory allocated by seq_open().
Signed-off-by: NLi Zefan <lizf@cn.fujitsu.com>
LKML-Reference: <4A67D8E8.3020500@cn.fujitsu.com>
Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>