Pick up these two commits from Arnaldo's perf/core tree:ca6a42586f: perf tools: Emit clearer message for sys_perf_event_open ENOENT returnc286c419c7: perf tools: Fixup exit path when not able to open events As they are really fixes we want to have sooner than laer. Signed-off-by: Ingo Molnar <mingo@elte.hu>