tools: Fix incorrect calculation of object size by sizeof

What we need to calculate is the size of the object, not the size of the
pointer.

Fixed: 51cfe7a3e8 ("perf python: Avoid 2 leak sanitizer issues")
Signed-off-by: Li Dong <lidong@vivo.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: opensource.kernel@vivo.com
Link: https://lore.kernel.org/r/20230619082036.410-1-lidong@vivo.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

tools/perf/util/scripting-engines/trace-event-python.c

@@ -771,12 +771,12 @@ static void set_regs_in_dict(PyObject *dict,
 	int size = __sw_hweight64(attr->sample_regs_intr) * 28;
 	char *bf = malloc(size);
 
-	regs_map(&sample->intr_regs, attr->sample_regs_intr, arch, bf, sizeof(bf));
+	regs_map(&sample->intr_regs, attr->sample_regs_intr, arch, bf, size);
 
 	pydict_set_item_string_decref(dict, "iregs",
 			_PyUnicode_FromString(bf));
 
-	regs_map(&sample->user_regs, attr->sample_regs_user, arch, bf, sizeof(bf));
+	regs_map(&sample->user_regs, attr->sample_regs_user, arch, bf, size);
 
 	pydict_set_item_string_decref(dict, "uregs",
 			_PyUnicode_FromString(bf));