perf parse-events: Directly pass PMU to parse_events_add_pmu()

Avoid passing the name of a PMU then finding it again, just directly
pass the PMU. parse_events_multi_pmu_add_or_add_pmu() is the only version
that needs to find a PMU, so move the find there. Remove the error
message as parse_events_multi_pmu_add_or_add_pmu will given an error at
the end when a name isn't either a PMU name or event name. Without the
error message being created the location in the input parameter (loc)
can be removed.

Signed-off-by: Ian Rogers <[email protected]>
Reviewed-by: Kan Liang <[email protected]>
Tested-by: Atish Patra <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Beeman Strong <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: James Clark <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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