[PATCH] USB: Stop hiddev generating empty events

hiddev is mistakenly returning empty hiddev_event structures for report
events. According to Documentation/usb/hiddev.txt, report events are
only sent when HIDDEV_FLAG_REPORT and HIDDEV_FLAG_UREF are both set.
Currently, report events from hid cause hiddev to generate empty
hiddev_event events when HIDDEV_FLAG_UREF is not set.

drivers/usb/input/hiddev.c

@@ -213,6 +213,7 @@ void hiddev_report_event(struct hid_device *hid, struct hid_report *report)
 	  ((type == HID_OUTPUT_REPORT) ? HID_REPORT_TYPE_OUTPUT : 
 	   ((type == HID_FEATURE_REPORT) ? HID_REPORT_TYPE_FEATURE:0));
 	uref.report_id = report->id;
+	uref.field_index = HID_FIELD_INDEX_NONE;
 
 	hiddev_send_event(hid, &uref);
 }