perf stat: Fix invalid output handle

In this context, 'os' is already a pointer so the extra dereference
isn't required. This fixes the following test failure on aarch64:

  $ ./perf test "json output" -vvv
  92: perf stat JSON output linter                                    :
  --- start ---
  Checking json output: no args Test failed for input:
  ...
  Fatal error: glibc detected an invalid stdio handle
  ---- end ----
  perf stat JSON output linter: FAILED!

Fixes: e7f4da31 ("perf stat: Pass struct outstate to printout()")
Signed-off-by: James Clark <james.clark@arm.com>
Tested-by: Athira Jajeev <atrajeev@linux.vnet.ibm.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20221130111521.334152-2-james.clark@arm.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/stat-display.c

@@ -731,7 +731,7 @@ static void printout(struct perf_stat_config *config, struct outstate *os,
 		perf_stat__print_shadow_stats(config, counter, uval, map_idx,
 					      &out, &config->metric_events, &rt_stat);
 	} else {
-		pm(config, &os, /*color=*/NULL, /*format=*/NULL, /*unit=*/"", /*val=*/0);
+		pm(config, os, /*color=*/NULL, /*format=*/NULL, /*unit=*/"", /*val=*/0);
 	}
 
 	if (!config->metric_only) {