perf jevents: Make build fail on JSON parse error

Today, when a JSON file fails parsing the build continues, but there are
no json files built in, which is difficult to debug later.  Make the
build stop on a parse error instead.

v2: Add fixes from Sukadev. Now we handle architectures
    with no JSON events correctly. And fix some stale comments.

Committer note:

Tested by running the cross build container tests, that were all failing
for v1.

Signed-off-by: Andi Kleen <[email protected]>
Acked-by: Jiri Olsa <[email protected]>
Tested-by: Arnaldo Carvalho de Melo <[email protected]>
Cc: Sukadev Bhattiprolu <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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