o extattrctl initattr, when pre-allocating store for extended attributes,   computed a a chunksize that didn't include the extended attribute   header.  This was a non-fatal error, in that it was just writing out   zeros anyway, but did have the effect of not pre-allocating the   right amount of disk space.  This fix calculates chunksize to include   the attribute header.
o extattrctl initattr, when pre-allocating store for extended attributes,
  computed a a chunksize that didn't include the extended attribute
  header.  This was a non-fatal error, in that it was just writing out
  zeros anyway, but did have the effect of not pre-allocating the
  right amount of disk space.  This fix calculates chunksize to include
  the attribute header.

Submitted by:	Dale Rahn
Sponsored by:	DARPA, UPenn POSSE Project
Obtained from:	OpenBSD

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase