surface pro 4: fix compare_const_fl.cocci warnings

---
 drivers/platform/x86/surfacepro3_button.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
 
diff --git a/drivers/platform/x86/surfacepro3_button.c b/drivers/platform/x86/surfacepro3_button.c
index b9c38f6..700e0fa 100644
--- a/drivers/platform/x86/surfacepro3_button.c
+++ b/drivers/platform/x86/surfacepro3_button.c
@@ -111,7 +111,7 @@ static void surface_button_notify(struct acpi_device *device, u32 event)
 		break;
 	}
 	input = button->input;
-	if (KEY_RESERVED == key_code)
+	if (key_code == KEY_RESERVED)
 		return;
 	if (pressed)
 		pm_wakeup_event(&device->dev, 0);