am 87d0366d: Fix NPE caused by applications that try to hide keyguard while it\'s not showing

* commit '87d0366d9e41a0fb1e20cc021ba391ed92fab385':
  Fix NPE caused by applications that try to hide keyguard while it's not showing

policy/src/com/android/internal/policy/impl/keyguard/KeyguardViewMediator.java

@@ -881,7 +881,9 @@ public class KeyguardViewMediator {
      * Dismiss the keyguard through the security layers.
      */
     public void dismiss() {
-        mKeyguardViewManager.dismiss();
+        if (mShowing && !mHidden) {
+            mKeyguardViewManager.dismiss();
+        }
     }
 
     /**