--- xnu/xnu-4570.1.46/iokit/Kernel/IOInterruptController.cpp
+++ xnu/xnu-4570.71.2/iokit/Kernel/IOInterruptController.cpp
@@ -466,8 +466,6 @@
 {
   int      cnt, interruptType;
   IOReturn error;
-
-  reserved = NULL;
   
   if (!super::init())
     return kIOReturnNoResources;