xfs: remove the MAXNAMELEN check from xfs_attr_args_init

xfs: remove the MAXNAMELEN check from xfs_attr_args_init

Source kernel commit: 4df28c64e4388ac5fa59cd58f9fd6592aae533a2

All the callers already check the length when allocating the
in-kernel xattrs buffers.

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>