perf script: Don't assume evsel position of tracking events
The tracking event does not have to be the first event so replace perf_evlist__first() with perf_evlist__id2evsel() which uses the event ID to find the correct evsel. Signed-off-by: NAdrian Hunter <adrian.hunter@intel.com> Acked-by: NPeter Zijlstra (Intel) <peterz@infradead.org> Tested-by: NJiri Olsa <jolsa@redhat.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Cc: Pawel Moll <pawel.moll@arm.com> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/r/1437471846-26995-5-git-send-email-adrian.hunter@intel.comSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
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