tracing/events: fix memory leak when unloading module
When unloading a module, memory allocated by init_preds() and trace_define_field() is not freed. [ Impact: fix memory leak ] Signed-off-by: NLi Zefan <lizf@cn.fujitsu.com> Acked-by: NFrederic Weisbecker <fweisbec@gmail.com> Acked-by: NSteven Rostedt <rostedt@goodmis.org> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <4A00F6E0.3040503@cn.fujitsu.com> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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