server: libxtreemfs for Java: Fixed bug that data of a read request was not...

server: libxtreemfs for Java: Fixed bug that data of a read request was not freed if no read buffer was given.

git-svn-id: https://xtreemfs.googlecode.com/svn/trunk@3558 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534