Linux 3.5: encode_fh API change

Linux 3.5: encode_fh API change

The encode_fh export operation now expects two inode arguments
instead of a dentry and a "connectable" flag.  Use the inode of
the dentry we're interested in, and NULL as the parent inode which
is the same as passing a 0 flag in the previous API.

Change-Id: I05cf146fb2a4bacdca20a9f108d04ccb11530804
Reviewed-on: http://gerrit.openafs.org/7523
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementix.org>
(cherry picked from commit 5227148ae17949705487ea673d558ebfe143e635)
Reviewed-on: http://gerrit.openafs.org/7579