remove unnecessary switchUser call

If userId doesn't change, no need to do switchuser.or it will
introduce some tweak for gps modules in quick off/on because
they need cost time in off/on.

Change-Id: Ie5e408dc8be69c8a63a18bcb2cfe478cef4d70e6
Signed-off-by: Jianzheng Zhou <jianzheng.zhou@freescale.com>

services/java/com/android/server/LocationManagerService.java

@@ -452,6 +452,9 @@ public class LocationManagerService extends ILocationManager.Stub {
      * @param userId the new active user's UserId
      */
     private void switchUser(int userId) {
+        if (mCurrentUserId == userId) {
+            return;
+        }
         mBlacklist.switchUser(userId);
         mLocationHandler.removeMessages(MSG_LOCATION_CHANGED);
         synchronized (mLock) {