tracing: Prevent build warning: 'ftrace_graph_buf' defined but not used
Prevent build warning when CONFIG_FUNCTION_GRAPH_TRACER is not set. Signed-off-by: NLai Jiangshan <laijs@cn.fujitsu.com> LKML-Reference: <4AF24381.5060307@cn.fujitsu.com> Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
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