--- xnu/xnu-517.7.21/iokit/Kernel/IOInterruptEventSource.cpp
+++ xnu/xnu-344.34/iokit/Kernel/IOInterruptEventSource.cpp
@@ -72,9 +72,9 @@
 OSMetaClassDefineReservedUnused(IOInterruptEventSource, 7);
 
 bool IOInterruptEventSource::init(OSObject *inOwner,
-				  Action inAction,
-				  IOService *inProvider,
-				  int inIntIndex)
+				  Action inAction = 0,
+				  IOService *inProvider = 0,
+				  int inIntIndex = 0)
 {
     bool res = true;
 
@@ -123,7 +123,7 @@
     IOInterruptEventSource *me = new IOInterruptEventSource;
 
     if (me && !me->init(inOwner, inAction, inProvider, inIntIndex)) {
-        me->release();
+        me->free();
         return 0;
     }