xfs: remove the xfs_inode argument to xfs_attr_get_ilocked

xfs: remove the xfs_inode argument to xfs_attr_get_ilocked

Source kernel commit: c36f533f14075fee35f8beeb1729d0975fb2e137

The inode can easily be derived from the args structure.  Also
don't bother with else statements after early returns.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Chandan Rajendra <chandanrlinux@gmail.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>