xfs/614: fix test for parent pointers

xfs/614: fix test for parent pointers

Almost a decade ago, the initial rmap/reflink patches were merged with
hugely overestimated log space reservations.  Although we adjusted the
actual runtime reservations a few years ago, we left the minimum log
size calculations in place to avoid compatibility problems between newer
mkfs and older kernels.

With the introduction of parent pointers, we can finally use the more
accurate reservations for minlog computations and mkfs can format
smaller logs as a result.  This causes the output of this test to
change, though it wasn't needed until parent pointers were enabled by
default.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Zorro Lang <zlang@redhat.com>
Signed-off-by: Zorro Lang <zlang@kernel.org>