RFA [8u-dev]: JDK-8028792 - (ch) Channels native code needs to be checked for methods calling JNI with pending exceptions

[Mark Sheppard]

Hi
   please oblige and approve the following change

http://cr.openjdk.java.net/~msheppar/8051471/webrev/
for
https://bugs.openjdk.java.net/browse/JDK-8051471

which is a backport of
https://bugs.openjdk.java.net/browse/JDK-8028792

null return checks added to JNI calls

changeset: http://hg.openjdk.java.net/jdk9/jdk9/jdk/rev/01b83dcdcc36
review: 
http://mail.openjdk.java.net/pipermail/nio-dev/2014-February/002508.html

regards
Mark