Don't crash if the interface disappears just after appearing.

If the interface disappears between interfaceAdded() and
setInterfaceUp, we'll crash with an IllegalStateException in
NetworkManagementService#setInterfaceConfig.

Ignore the error instead. This should be safe because we don't
modify any state unless our calls succeed.

(cherry picked from commit 17f4e4a027)

Bug: 62870779
Test: builds aosp_bullhead-eng
Test: builds marlin-eng
Test: exception is logged and device doesn't crash when unplugging USB ethernet adapter while it's being initialized
Change-Id: If8c2375f7fffe25a9fa79dc4f1981c745384a276

service-t/src/com/android/server/ethernet/EthernetNetworkFactory.java

@@ -208,7 +208,7 @@ class EthernetNetworkFactory {
             InterfaceConfiguration config = mNMService.getInterfaceConfig(iface);
 
             if (config == null) {
-                Log.e(TAG, "Null iterface config for " + iface + ". Bailing out.");
+                Log.e(TAG, "Null interface config for " + iface + ". Bailing out.");
                 return;
             }
 
@@ -220,7 +220,9 @@ class EthernetNetworkFactory {
                 Log.e(TAG, "Interface unexpectedly changed from " + iface + " to " + mIface);
                 mNMService.setInterfaceDown(iface);
             }
-        } catch (RemoteException e) {
+        } catch (RemoteException | IllegalStateException e) {
+            // Either the system is crashing or the interface has disappeared. Just ignore the
+            // error; we haven't modified any state because we only do that if our calls succeed.
             Log.e(TAG, "Error upping interface " + mIface + ": " + e);
         }
     }