ftrace: avoid double-free of dyn_ftrace
If dyn_ftrace is freed before ftrace_release(), ftrace_release() will free it again and make ftrace_free_records wrong. Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com> Cc: "Steven Rostedt ;" <rostedt@goodmis.org> LKML-Reference: <49BA23D9.1050900@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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