xfs: bugfixes for 3.13-rc4

- fix for buffer overrun in agfl with growfs on v4 superblock
- return EINVAL if requested discard length is less than a block
- fix possible memory corruption in xfs_attrlist_by_handle()
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.10 (GNU/Linux)
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=SbPd
-----END PGP SIGNATURE-----