NPE in isTrackpadDevice

Bug: 285628328
Test: atest inputflinger_tests
Change-Id: I136ee119fdd85cbdcd37f48c42f421f67f5f9e9d

packages/SystemUI/src/com/android/systemui/navigationbar/gestural/EdgeBackGestureHandler.java

@@ -885,6 +885,9 @@ public class EdgeBackGestureHandler implements PluginListener<NavigationEdgeBack
 
     private boolean isTrackpadDevice(int deviceId) {
         InputDevice inputDevice = mInputManager.getInputDevice(deviceId);
+        if (inputDevice == null) {
+            return false;
+        }
         return inputDevice.getSources() == (InputDevice.SOURCE_MOUSE
                 | InputDevice.SOURCE_TOUCHPAD);
     }