Clear identity in LockSettingsInternal.getUserPasswordMetrics

It is an implementation of LockSettingsInternal API which
is callable only within system server, so permission check
seems unnecessary.

Bug: 256170784
Bug: 268313443
Test: manual with TestDPC
Change-Id: I123402351ed1e69bea9a2496a07fd57e6d467e14

services/core/java/com/android/server/locksettings/LockSettingsService.java

@@ -3439,10 +3439,10 @@ public class LockSettingsService extends ILockSettings.Stub {
                     Slog.w(TAG, "Querying password metrics for unified challenge profile: "
                             + userHandle);
                 }
+                return LockSettingsService.this.getUserPasswordMetrics(userHandle);
             } finally {
                 Binder.restoreCallingIdentity(identity);
             }
-            return LockSettingsService.this.getUserPasswordMetrics(userHandle);
         }
 
         @Override