[PATCH] acpi: fix 'return' with no value build warning

[Neal Liu <neal.liu@xxxxxxxxxxxx>]

Fixing CFI issue which introduced by commit efe9711214e6 is
incomplete.
Add return value to fix return-type build warning.

Signed-off-by: Neal Liu <neal.liu@xxxxxxxxxxxx>
---
 drivers/acpi/processor_idle.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 6ffb6c9..6870020 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -664,11 +664,11 @@ static int acpi_idle_enter_s2idle(struct cpuidle_device *dev,
 		struct acpi_processor *pr = __this_cpu_read(processors);
 
 		if (unlikely(!pr))
-			return;
+			return -EFAULT;
 
 		if (pr->flags.bm_check) {
 			acpi_idle_enter_bm(pr, cx, false);
-			return;
+			return 0;
 		} else {
 			ACPI_FLUSH_CPU_CACHE();
 		}
-- 
1.7.9.5