RFR [8043507]: javax.smartcardio.CardTerminals.list() fails on MacOSX

[Ivan Gerasimov]

Hello!

The function javax.smartcardio.CardTerminals.list() sometimes fails when 
called from an app running on MacOSX.
The problem is due to that CALL_SCardListReaders(_, _, _, &size) expects 
the size variable to be of size uint32_t on os x, but we provide a 
pointer to 64 bit int instead.
As a result, the higher bits may contain garbage upon return, and we try 
to allocate a too large block of memory.

The simplest solution is to initialize 'size' to zero before the call.

No new tests with the fix, as the exiting tests already demonstrate 
intermittent failures because of this bug.

For example, I've seem how ./sun/security/smartcardio/TestDefault.java 
failed once on every few hundred runs.
With the fix this test doesn't fail even when running in a loop with 
thousands of iterations.

Would you please review this simple fix?

BUGURL: https://bugs.openjdk.java.net/browse/JDK-8043507
WEBREV: http://cr.openjdk.java.net/~igerasim/8043507/0/webrev/

Sincerely yours,
Ivan