perf_events: Fix style nits
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <20091123103819.613427378@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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