Update clang-format

Refer:https://github.com/openbmc/docs/blob/ac5d544553934f8083c61c5986a1420261bc8a4c/style/cpp/.clang-format

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I593ddf950d14009ab77251fd6d3f248214661765
diff --git a/src/button_handler.cpp b/src/button_handler.cpp
index 55f5db5..a819183 100644
--- a/src/button_handler.cpp
+++ b/src/button_handler.cpp
@@ -196,7 +196,8 @@
 
     switch (powerEventType)
     {
-        case PowerEvent::powerPressed: {
+        case PowerEvent::powerPressed:
+        {
             objPathName = HOST_STATE_OBJECT_NAME + hostNumStr;
             dbusIfaceName = hostIface;
             transitionName = "RequestedHostTransition";
@@ -211,7 +212,8 @@
 
             break;
         }
-        case PowerEvent::longPowerPressed: {
+        case PowerEvent::longPowerPressed:
+        {
             dbusIfaceName = chassisIface;
             transitionName = "RequestedPowerTransition";
             objPathName = CHASSIS_STATE_OBJECT_NAME + hostNumStr;
@@ -244,8 +246,8 @@
             break;
         }
 
-        case PowerEvent::resetPressed: {
-
+        case PowerEvent::resetPressed:
+        {
             objPathName = HOST_STATE_OBJECT_NAME + hostNumStr;
             dbusIfaceName = hostIface;
             transitionName = "RequestedHostTransition";
@@ -260,7 +262,8 @@
             transition = Host::Transition::Reboot;
             break;
         }
-        default: {
+        default:
+        {
             log<level::ERR>(
                 "Invalid power event. skipping...",
                 entry("EVENT=%d", static_cast<int>(powerEventType)));