ACPI / EC: Fix unused function warning when CONFIG_PM_SLEEP=n

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 6805310..48e19d0 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -526,6 +526,7 @@
 		acpi_ec_clear(ec);
 }
 
+#ifdef CONFIG_PM_SLEEP
 static bool acpi_ec_query_flushed(struct acpi_ec *ec)
 {
 	bool flushed;
@@ -557,6 +558,7 @@
 	spin_unlock_irqrestore(&ec->lock, flags);
 	__acpi_ec_flush_event(ec);
 }
+#endif /* CONFIG_PM_SLEEP */
 
 static bool acpi_ec_guard_event(struct acpi_ec *ec)
 {