perf tools: Enable strict JSON parsing

This is to ensure that the PMU event files can always be parsed by
other tools.

Testing
=======

* There are no errors when parsing files for all architectures:
# pmu-events/jevents nds32 pmu-events/arch/ test
# pmu-events/jevents s390 pmu-events/arch/ test
# pmu-events/jevents powerpc pmu-events/arch/ test
# pmu-events/jevents arm64 pmu-events/arch/ test
# pmu-events/jevents test pmu-events/arch/ test
# pmu-events/jevents x86 pmu-events/arch/ test

* Trailing and leading commas now cause a parse error

* Double commas now cause a parse error

* Compilation and parsing works with strict mode disabled and enabled

* A diff of the output files shows no changes

Reviewed-by: Andi Kleen <[e-mail]>
Reviewed-by: Kajol Jain<[e-mail]>
Signed-off-by: James Clark <[e-mail]>
Acked-by: Jiri Olsa <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: [e-mail]
Cc: John Garry <[e-mail]>
Cc: Leo Yan <[e-mail]>
Cc: Mark Rutland <[e-mail]>
Cc: Mathieu Poirier <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: [e-mail]
Cc: Will Deacon <[e-mail]>
Cc: [e-mail]
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/pmu-events/jsmn.c

···
 
 #include <stdlib.h>
 #include "jsmn.h"
+#define JSMN_STRICT
 
 /*
  * Allocates a fresh unused token from the token pool.