Macros in bsd/miscfs/nullfs

• MOUNTTONULLMOUNT bsd/miscfs/nullfs/null.h:87
• NULL_NHASH bsd/miscfs/nullfs/null_subr.c:88
• NULLTOV bsd/miscfs/nullfs/null.h:89
• NULLVPTOLOWERVP bsd/miscfs/nullfs/null.h:92
• VTONULL bsd/miscfs/nullfs/null.h:88