perf bench sched-messaging: Drop barf()

Instead of reinventing the wheel, we can use err(2) when dealing with
fatal errors. Exit code is now always EXIT_FAILURE (1).

Signed-off-by: Davidlohr Bueso <[email protected]>
Cc: Aswin Chandramouleeswaran <[email protected]>
Cc: Hitoshi Mitake <[email protected]>
Cc: Jiri Olsa <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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