perf jevents: Use name for special find value (PMU_EVENTS__NOT_FOUND)

-1000 was used as a special value added in Commit 3d5045492ab2 ("perf
pmu-events: Add pmu_events_table__find_event()") to show that 1 table
lacked a PMU/event but that didn't terminate the search in other
tables.

Add a new constant PMU_EVENTS__NOT_FOUND for this value and use it.

Reviewed-by: John Garry <[email protected]>
Signed-off-by: Ian Rogers <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jing Zhang <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Oliver Sang <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Philip Li <[email protected]>
Cc: Sandipan Das <[email protected]>
Cc: Weilin Wang <[email protected]>
Cc: Xu Yang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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