perf: Fix mmap_page::offset computation
There's multiple reason the counter might be unavailable, change the condition to !->index since perf_event_index() should return 0 for all those cases. Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/n/tip-1ixr3olci40w8rgv2evv2ldh@git.kernel.orgSigned-off-by: NIngo Molnar <mingo@elte.hu>
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