tracing: Kill trace_array->waiter
Trivial. trace_array->waiter has no users since 6eaaa5d5 "tracing/core: use appropriate waiting on trace_pipe". Link: http://lkml.kernel.org/r/20130719142036.GA1594@redhat.comSigned-off-by: NOleg Nesterov <oleg@redhat.com> Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
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