Fix HID_Host_SetIdlePeriod() function to send the correct request type to the device, remove reference to unavailable (and not needed) local variable.

LUFA/Drivers/USB/Class/Host/HID.c

@@ -362,7 +362,7 @@ uint8_t HID_Host_SetIdlePeriod(USB_ClassInfo_HID_Host_t* const HIDInterfaceInfo,
 {
 	USB_ControlRequest = (USB_Request_Header_t)
 		{
-			.bmRequestType = (REQDIR_DEVICETOHOST | REQTYPE_STANDARD | REQREC_INTERFACE),
+			.bmRequestType = (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE),
 			.bRequest      = HID_REQ_SetIdle,
 			.wValue        = ((MS << 6) & 0xFF00),
 			.wIndex        = HIDInterfaceInfo->State.InterfaceNumber,
@@ -371,7 +371,7 @@ uint8_t HID_Host_SetIdlePeriod(USB_ClassInfo_HID_Host_t* const HIDInterfaceInfo,
 
 	Pipe_SelectPipe(PIPE_CONTROLPIPE);
 
-	return USB_Host_SendControlRequest(HIDReportData);
+	return USB_Host_SendControlRequest(NULL);
 }
 
 #if !defined(HID_HOST_BOOT_PROTOCOL_ONLY)

LUFA/Drivers/USB/Class/Host/HID.h

@@ -261,7 +261,7 @@
 			 *  \return A value from the \ref USB_Host_SendControlErrorCodes_t enum.
 			 */
 			uint8_t HID_Host_SetIdlePeriod(USB_ClassInfo_HID_Host_t* const HIDInterfaceInfo,
-			                               const uint16_t MS);
+			                               const uint16_t MS) ATTR_NON_NULL_PTR_ARG(1);
 
 			#if !defined(HID_HOST_BOOT_PROTOCOL_ONLY)
 			/** Switches the attached HID device's reporting protocol over to the standard Report protocol mode. This also retrieves