perf ftrace: Remove needless code setting default tracer
As a result of commit a3497642c261 ("perf ftrace: Make 'function_graph' be the default tracer") the ftrace.tracer variable can't be NULL but the other code setting default tracer remained. Signed-off-by: Taeung Song <treeze.taeung@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/r/1485423339-22780-1-git-send-email-treeze.taeung@gmail.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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