Macros starting with 'd' in ufs

• dbtofsb ufs/fs.h:332
• DFASTLINK ufs/dinode.h:101
• DIRSIZ ufs/dir.h:81
• dkminor ufs/ufs_disksubr.c:150
• dkpart ufs/ufs_disksubr.c:149
• dkunit ufs/ufs_disksubr.c:148
• DQREF ufs/quota.h:169
• dtog ufs/fs.h:362
• dtogd ufs/fs.h:363