perf_events: get rid of "PAPI Error: Didn't close all events" error
perf_events: get rid of "PAPI Error: Didn't close all events" error

This was more meant as a warning; it could trigger when closing
an EventSet that had an event partially added but failed for some
reason.

pyrovski/papi,arm-hpc/papi,pyrovski/papi,pyrovski/papi,pyrovski/papi,arm-hpc/papi,pyrovski/papi,arm-hpc/papi,pyrovski/papi,arm-hpc/papi,pyrovski/papi,arm-hpc/papi,pyrovski/papi,arm-hpc/papi,arm-hpc/papi