* amd/nfs_subr.c (mp_to_fh): Replace xstrlcpy with memcpy because the

* amd/nfs_subr.c (mp_to_fh): Replace xstrlcpy with memcpy because the
source buffer is treated more as a filehandle than a string.

* amd/nfs_subr.c (fh_to_mp3): Replace xstrlcpy with memcpy because the
source buffer is treated more as a filehandle than a string.

* amd/opts.c (free_op): No longer need to assign pointer to NULL
after XFREE.

* amd/opts.c (expand_op): Revert back to using strncpy() instead
of xstrlcpy.  The code is correct and relies on the semantics of
strncpy.

* libamu/mount_fs.c (compute_nfs_args): Leave XXX warning that use
of xstrlcpy in NFS_HN_DREF may corrupt a struct nfs_args, or
truncate our concocted "hostname:/path" string prematurely if the
nap->hostname field is ever less than 64 bytes long
(MAXHOSTNAMELEN).

* libamu/util.c (xstrlcpy): Return immediately if len is 0 to
avoid unnecessary work.  Log an error and return if len is less
than 0.