Macros in bsd/miscfs/nullfs

• MOUNTTONULLMOUNT bsd/miscfs/nullfs/null.h:84
• NULL_NHASH bsd/miscfs/nullfs/null_subr.c:85
• NULLTOV bsd/miscfs/nullfs/null.h:86
• NULLVPTOLOWERVP bsd/miscfs/nullfs/null.h:89
• VTONULL bsd/miscfs/nullfs/null.h:85