[NTOSKRNL]

[NTOSKRNL]
- Fix a horrible casting bug
- EventCategoryData1 is a pointer to a GUID not a pointer to a UNICODE_STRING
- Convert the GUID into a UNICODE_STRING properly by using RtlStringFromGUID and pass that string to RtlCompareUnicodeString
- Fix another bug which results in us sending EventCategoryHardwareProfileChange and EventCategoryTargetDeviceChange events to everyone registered for PnP notifications
- Fixes sending EventCategoryDeviceInterfaceChange notifications that happen after calling IoRegisterPlugPlayNotification

svn path=/trunk/; revision=47064