xfs: refactor buffer cancellation table allocation

[ Upstream commit 27232349 ]

Move the code that allocates and frees the buffer cancellation tables
used by log recovery into the file that actually uses the tables.  This
is a precursor to some cleanups and a memory leak fix.

( backport: dependency of 8db074bd )

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
Signed-off-by: Leah Rumancik <leah.rumancik@gmail.com>
Acked-by: Chandan Babu R <chandanbabu@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>