ACPI: LPIT: Avoid u32 multiplication overflow

In lpit_update_residency() there is a possibility of overflow
in multiplication, if tsc_khz is large enough (> UINT_MAX/1000).

Change multiplication to mul_u32_u32().

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: eeb2d80d ("ACPI / LPIT: Add Low Power Idle Table (LPIT) support")
Signed-off-by: Nikita Kiryushin <kiryushin@ancud.ru>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/acpi_lpit.c

@@ -105,7 +105,7 @@ static void lpit_update_residency(struct lpit_residency_info *info,
 		return;
 
 	info->frequency = lpit_native->counter_frequency ?
-				lpit_native->counter_frequency : tsc_khz * 1000;
+				lpit_native->counter_frequency : mul_u32_u32(tsc_khz, 1000U);
 	if (!info->frequency)
 		info->frequency = 1;