HID: core: prevent out-of-bound readings

Plugging a Logitech DJ receiver with KASAN activated raises a bunch of
out-of-bound readings.

The fields are allocated up to MAX_USAGE, meaning that potentially, we do
not have enough fields to fit the incoming values.
Add checks and silence KASAN.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
void hid_output_report(struct hid_report *report, __u8 *data)
{
	unsigned n;

	if (report->id > 0)
		*data++ = report->id;

	memset(data, 0, ((report->size - 1) >> 3) + 1);
	for (n = 0; n < report->maxfield; n++)
		hid_output_field(report->device, report->field[n], data);
}

void hid_output_report(struct hid_report *report, __u8 *data)
{
	unsigned n;

	if (report->id > 0)
		*data++ = report->id;

	memset(data, 0, ((report->size - 1) >> 3) + 1);
	for (n = 0; n < report->maxfield; n++)
		hid_output_field(report->device, report->field[n], data);
}
