Fix NPE

Bug:172868901
Test:manual verification

device reboot once for UserInfo is null

Signed-off-by: wangshouchun <wangshouchun@xiaomi.com>
Change-Id: Iddb3eb077ce06fdb1be63ca34ebf8fe2e64f2638

services/core/java/com/android/server/pm/UserManagerService.java

@@ -5112,6 +5112,9 @@ public class UserManagerService extends IUserManager.Stub {
                                 debugMsg + " for another profile "
                                         + targetUserId + " from " + callingUserId);
                     }
+                    Slog.w(LOG_TAG, debugMsg + " for another profile "
+                            + targetUserId + " from " + callingUserId);
+                    return false;
                 }
 
                 UserInfo targetUserInfo = getUserInfoLU(targetUserId);