RFR(xs): 8150379: [windows] Fix Leaks in perfMemory_windows.cpp

[Thomas Stüfe]

Hi all,

please take a look at this small fix for two leaks
in perfMemory_windows.cpp.

bug report: https://bugs.openjdk.java.net/browse/JDK-8150379

webrev:
http://cr.openjdk.java.net/~stuefe/webrevs/8150379-fix-leaks-perfMemory_windows_cpp/webrev.00/webrev/

Thank you,

Thomas