perf annotate-data: Fix a buffer overflow in TUI browser

perf annotate-data: Fix a buffer overflow in TUI browser

In get_member_overhead(), k is updated when it has a entry in the
histogram.  But the entry->hists array is allocated with the number of
evsel in the group.  So the k should be reset when it iterates the event
using for_each_group_evsel(), otherwise it'd crash due to a buffer
overflow.

Fixes: cb1898f58e0f175d ("perf annotate-data: Support --skip-empty option")
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20240810191502.1947959-1-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>