i#1714 windows 10: fix known dll assert
i#1714 windows 10: fix known dll assert

Fixes an assert in initializing known dll information where the kernel
does not add the null character to the end of a UNICODE_STRING.

Review-URL: https://codereview.appspot.com/254630043

AmesianX/dynamorio,code4bones/dynamorio,daksunt/dynamorio,daksunt/dynamorio,code4bones/dynamorio,code4bones/dynamorio,AmesianX/dynamorio,daksunt/dynamorio,AmesianX/dynamorio,code4bones/dynamorio,AmesianX/dynamorio,daksunt/dynamorio,daksunt/dynamorio,code4bones/dynamorio,AmesianX/dynamorio