perf parse-events: Improve error message for double setting

Double setting information for an event would produce an error message
associated with the PMU rather than the term that was double setting.
Improve the error message to be on the term.

Before:

  $ perf stat -e 'cpu/inst_retired.any,inst_retired.any/' true
  event syntax error: 'cpu/inst_retired.any,inst_retired.any/'
                       \___ Bad event or PMU

  Unabled to find PMU or event on a PMU of 'cpu'
  Run 'perf list' for a list of valid events
  $

After:

  $ perf stat -e 'cpu/inst_retired.any,inst_retired.any/' true
  event syntax error: '..etired.any,inst_retired.any/'
                                    \___ Bad event or PMU

  Unabled to find PMU or event on a PMU of 'cpu'

  Initial error:

  event syntax error: '..etired.any,inst_retired.any/'
                                    \___ Attempt to set event's scale twice
  Run 'perf list' for a list of valid events

Signed-off-by: Ian Rogers <[email protected]>
Tested-by: Arnaldo Carvalho de Melo <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Gaosheng Cui <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: James Clark <[email protected]>
Cc: Jing Zhang <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: John Garry <[email protected]>
Cc: Kajol Jain <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Ravi Bangoria <[email protected]>
Cc: Rob Herring <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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