acpi: don't pass overflow_time to acpi_pm1_evt_get_sts

Pretty pointless, can easily be reached via ACPIREGS now.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/hw/acpi.h b/hw/acpi.h
index 530c86a..e1d5e3b 100644
--- a/hw/acpi.h
+++ b/hw/acpi.h
@@ -131,7 +131,7 @@
 }
 
 /* PM1a_EVT: piix and ich9 don't implement PM1b. */
-uint16_t acpi_pm1_evt_get_sts(ACPIREGS *ar, int64_t overflow_time);
+uint16_t acpi_pm1_evt_get_sts(ACPIREGS *ar);
 void acpi_pm1_evt_write_sts(ACPIREGS *ar, uint16_t val);
 void acpi_pm1_evt_power_down(ACPIREGS *ar);
 void acpi_pm1_evt_reset(ACPIREGS *ar);