Fix NPE in isPermissionReviewRequired().

We need to check if mPermissions is null.

Fixes: 169848819
Bug: 158736025
Test: presubmit
Change-Id: I3641cda64a3efdb25f2e45425edd993d1702bcf6

services/core/java/com/android/server/pm/permission/UidPermissionState.java

@@ -338,6 +338,9 @@ public final class UidPermissionState {
 
     public boolean isPermissionReviewRequired() {
         synchronized (mLock) {
+            if (mPermissions == null) {
+                return false;
+            }
             final int permissionsSize = mPermissions.size();
             for (int i = 0; i < permissionsSize; i++) {
                 final PermissionState permission = mPermissions.valueAt(i);