getxattr: return the size of the attribute value, not the caller-given size.  Also, copy up to $(attribute value size) data, not the caller-given size.
getxattr: return the size of the attribute value, not the caller-given
size.  Also, copy up to $(attribute value size) data, not the
caller-given size.

jcnelson/fskit,jcnelson/fskit