Fix missing MANAGE_USER error on calls to isDeviceSecure

A poorly placed clear identity was causing some crashes as
apps were required to have the MANAGE_USERS permission to
query if the current user is secured.

Change-Id: I1120b1e4405e78389fcbcb3e7d1dba8c80500da3
diff --git a/core/java/com/android/internal/widget/LockPatternUtils.java b/core/java/com/android/internal/widget/LockPatternUtils.java
index 89cb5b4..4e8f19c 100644
--- a/core/java/com/android/internal/widget/LockPatternUtils.java
+++ b/core/java/com/android/internal/widget/LockPatternUtils.java
@@ -893,7 +893,7 @@
      */
     public boolean isSeparateProfileChallengeEnabled(int userHandle) {
         UserInfo info = getUserManager().getUserInfo(userHandle);
-        if (!info.isManagedProfile()) {
+        if (info == null || !info.isManagedProfile()) {
             return false;
         }
         return getBoolean(SEPARATE_PROFILE_CHALLENGE_KEY, false, userHandle);
@@ -904,7 +904,7 @@
      */
     public boolean isSeparateProfileChallengeAllowed(int userHandle) {
         UserInfo info = getUserManager().getUserInfo(userHandle);
-        if (!info.isManagedProfile()) {
+        if (info == null || !info.isManagedProfile()) {
             return false;
         }
         return getDevicePolicyManager().isSeparateProfileChallengeAllowed(userHandle);