Variables starting with `r' in iokit/IOKit/firewire

• rcode iokit/IOKit/firewire/IOFireWireController.h:58
• RED_INST_SCAFFOLD iokit/IOKit/firewire/Makefile:49
• refcon iokit/IOKit/firewire/IOFWAddressSpace.h:52
• reset iokit/IOKit/firewire/IOFireWirePriv.h:181