[PATCH v2 0/2] Minor fixes error handling of perf stat

[Levi Yun]

This patchset fixes two issues that were seen when running
  "perf stat -r" with perf_event_paranoid=3

   1. failed with Too many open files.
     $ perf stat -r 1044 -- false
     ...
     failed to create 'go' pipe: Too many open files
     failed to prepare workload: Too many open files
     ...

   2. repating error message
     $ perf stat -r 1044 -- false
     Error:
     Access to performance monitoring and observability operations is limited.
     ...
     (repating with same error message 1044 times).

v2:
  - Add some comments.

Levi Yun (2):
  perf stat: Close cork_fd when create_perf_stat_counter() failed
  perf stat: Stop repeating when ref_perf_stat() returns -1

 tools/perf/builtin-stat.c | 11 ++++++++++-
 tools/perf/util/evlist.c  | 14 +++++++++++++-
 tools/perf/util/evlist.h  |  1 +
 3 files changed, 24 insertions(+), 2 deletions(-)

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LEVI:{C3F47F37-75D8-414A-A8BA-3980EC8A46D7}