xfs: skip all of xfs_file_release when shut down

xfs: skip all of xfs_file_release when shut down

There is no point in trying to free post-EOF blocks when the file system
is shutdown, as it will just error out ASAP.  Instead return instantly
when xfs_file_release is called on a shut down file system.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>