function-graph: use ftrace_graph_funcs directly
No need to store ftrace_graph_funcs in file->private. Acked-by: NFrederic Weisbecker <fweisbec@gmail.com> Signed-off-by: NLi Zefan <lizf@cn.fujitsu.com> LKML-Reference: <4AB32364.7020602@cn.fujitsu.com> Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
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