xfs: reduce the size of nr_ops for refcount btree cursors

xfs: reduce the size of nr_ops for refcount btree cursors

Source kernel commit: efb79ea31067ae3dd0f348eb06e6b9a5e9907078

We're never going to run more than 4 billion btree operations on a
refcount cursor, so shrink the field to an unsigned int to reduce the
structure size.  Fix whitespace alignment too.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>