--- xnu/xnu-792/iokit/Kernel/IOMultiMemoryDescriptor.cpp
+++ xnu/xnu-344.26/iokit/Kernel/IOMultiMemoryDescriptor.cpp
@@ -87,7 +87,7 @@
                                   IOMemoryDescriptor ** descriptors,
                                   UInt32                withCount,
                                   IODirection           withDirection,
-                                  bool                  asReference )
+                                  bool                  asReference = false )
 {
     //
     // Create a new IOMultiMemoryDescriptor.  The "buffer" is made up of several
@@ -118,7 +118,7 @@
                                   IOMemoryDescriptor ** descriptors,
                                   UInt32                withCount,
                                   IODirection           withDirection,
-                                  bool                  asReference )
+                                  bool                  asReference = false )
 {
     //
     // Initialize an IOMultiMemoryDescriptor. The "buffer" is made up of several
@@ -131,19 +131,10 @@
     assert(descriptors);
     assert(withCount);
 
-    // Release existing descriptors, if any
-    if ( _descriptors )
-    {
-        for ( unsigned index = 0; index < _descriptorsCount; index++ ) 
-            _descriptors[index]->release();
-
-        if ( _descriptorsIsAllocated )
-            IODelete(_descriptors, IOMemoryDescriptor *, _descriptorsCount);
-    } else {
-        // Ask our superclass' opinion.
-        if ( super::init() == false )  return false;
-    }
-    
+    // Ask our superclass' opinion.
+
+    if ( super::init() == false )  return false;
+
     // Initialize our minimal state.
 
     _descriptors            = 0;