6660 ufs may read too many indirect blocks, flush a random block to disk

*** 600,610 ****
                  blkflush(ip->i_dev, (daddr_t)fsbtodb(fs, ip->i_ib[0]));
                  return (0);
          }
  
          /* Write out all the first level indirect blocks */
!         for (i = 0; i <= NIADDR; i++) {
                  if ((blkno = ip->i_ib[i]) == 0)
                          continue;
                  blkflush(ip->i_dev, (daddr_t)fsbtodb(fs, blkno));
          }
          /* Write out second level of indirect blocks */
--- 600,610 ----
                  blkflush(ip->i_dev, (daddr_t)fsbtodb(fs, ip->i_ib[0]));
                  return (0);
          }
  
          /* Write out all the first level indirect blocks */
!         for (i = 0; i < NIADDR; i++) {
                  if ((blkno = ip->i_ib[i]) == 0)
                          continue;
                  blkflush(ip->i_dev, (daddr_t)fsbtodb(fs, blkno));
          }
          /* Write out second level of indirect blocks */