[9] [XS] RFR 8138819 : File descriptors leak during construction of selector

[Ivan Gerasimov]

Hello!

When constructing different kinds of Selector, a pair of file 
descriptors (the pipe ends) are created.
If later in the constructor an exception is thrown, these will remain open.
Would you please help review the fix?

BUGURL: https://bugs.openjdk.java.net/browse/JDK-8138819
WEBREV: http://cr.openjdk.java.net/~igerasim/8138819/00/webrev/

Sincerely yours,
Ivan