Defines starting with `n' in bsd/dev/ppc/drvUSBCMD

• __NAMEREGISTRY__ bsd/dev/ppc/drvUSBCMD/nameregistry.h:45
• nil bsd/dev/ppc/drvUSBCMD/mactypes.h:98
• N_SWIS bsd/dev/ppc/drvUSBCMD/driverservicespriv.h:161
• NULL bsd/dev/ppc/drvUSBCMD/mactypes.h:91