Fix permission accessing getCurrentUser

Bug: 7174737
Change-Id: I0a6a9a46f4115743d16ada401cd67e3cf30fb380

Author: isheriff

services/java/com/android/server/WifiService.java

@@ -836,7 +836,11 @@ public WifiInfo getConnectionInfo() {
      */
     public List<ScanResult> getScanResults() {
         enforceAccessPermission();
-        if (UserHandle.getCallingUserId() != ActivityManager.getCurrentUser()) {
+        int userId = UserHandle.getCallingUserId();
+        long ident = Binder.clearCallingIdentity();
+        int currentUser = ActivityManager.getCurrentUser();
+        Binder.restoreCallingIdentity(ident);
+        if (userId != currentUser) {
             return new ArrayList<ScanResult>();
         } else {
             return mWifiStateMachine.syncGetScanResultsList();