xfs: pass the correct flag to xlog_write_iclog

xlog_write_iclog expects a bool for the second argument.  While any
non-0 value happens to work fine this makes all calls consistent.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>