WifiP2pSettings requests network info from WifiP2pManager whenever it gets onDeviceInfoAvailable, but sChannel may be null causing an IllegalArgumentException. Check that sChannel is not null before requesting network info. Bug: 289004627 Test: atest WifiP2pSettingsTest Change-Id: Ied8c3f8a894683d7b8e368e5c52343adb7d05e4b