Log failure of send to target. Restore driver.cpp to have unload rout…

…ine.

TailLight/SetTaillightBlack.cpp

@@ -265,6 +265,7 @@ NTSTATUS SetBlackAsync(WDFDEVICE device,
             WdfObjectDelete(request);
             request = 0;
             status = STATUS_UNSUCCESSFUL;
+            KdPrint(("TailLight: Request not delivered to HIDUSB.\n"));
         }
     }
 

TailLight/driver.cpp

@@ -5,20 +5,20 @@
 NTSTATUS DriverEntry(
     _In_ PDRIVER_OBJECT  DriverObject,
     _In_ PUNICODE_STRING RegistryPath
-    )
+)
 {
     KdPrint(("TailLight: DriverEntry - WDF version built on %s %s\n", __DATE__, __TIME__));
 
     WDF_DRIVER_CONFIG params = {};
     WDF_DRIVER_CONFIG_INIT(/*out*/&params, EvtDriverDeviceAdd);
-    params.DriverPoolTag = POOL_TAG;
+    params.EvtDriverUnload = EvtDriverUnload;
 
     // Create the framework WDFDRIVER object, with the handle to it returned in Driver.
-    NTSTATUS status = WdfDriverCreate(DriverObject, 
-                             RegistryPath, 
-                             WDF_NO_OBJECT_ATTRIBUTES, 
-                             &params, 
-                             WDF_NO_HANDLE); // [out]
+    NTSTATUS status = WdfDriverCreate(DriverObject,
+        RegistryPath,
+        WDF_NO_OBJECT_ATTRIBUTES,
+        &params,
+        WDF_NO_HANDLE); // [out]
     if (!NT_SUCCESS(status)) {
         // Framework will automatically cleanup on error Status return
         KdPrint(("TailLight: Error Creating WDFDRIVER 0x%x\n", status));
@@ -27,3 +27,13 @@ NTSTATUS DriverEntry(
     return status;
 }
 
+
+/** Driver unload callback.
+    Used to perform operations that must take place before the driver is unloaded.  */
+VOID EvtDriverUnload(
+    _In_ WDFDRIVER Driver
+)
+{
+    UNREFERENCED_PARAMETER(Driver);
+    KdPrint(("TailLight: DriverUnload.\n"));
+}