xfsprogs: xfs_quota: don't double project block counts

xfsprogs: xfs_quota: don't double project block counts

In projects_free_space_data() all of the block counts returned are
doubled.  This was probably a mistaken attempt to convert to or from
512-byte basic block units.  The caller expects the value returned
to be in 512-byte units, which is exactly what the fs_disk_quota
structure holds, so there should be no doubling.

The effect of this bug is that the disk space used by the "df"
xfs_quota command shows block counts twice what they should be.

SGI PV 1015651

Signed-off-by: Alex Elder <aelder@sgi.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>