AsyncRequestPtr maybe NULL after its callback function is invoke. So Caching it temporary.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@2217 6f19259b-4bc3-4df7-8a09-765794883524

EdkModulePkg/Bus/Pci/Ehci/Dxe/EhciSched.c

@@ -2997,6 +2997,7 @@ Returns:
   UINTN               ErrQtdPos;
   UINTN               ActualLen;
   UINT32              TransferResult;
+  UINT8               *ReceiveBuffer;
   UINT8               *ProcessBuffer;
   EHCI_ASYNC_REQUEST  *NextPtr;
 
@@ -3042,6 +3043,8 @@ Returns:
       ActualLen
       );
 
+    UpdateAsyncRequestTransfer (AsyncRequestPtr, TransferResult, ErrQtdPos);
+
     NextPtr = AsyncRequestPtr->Next;
 
     if (EFI_USB_NOERROR == TransferResult) {
@@ -3069,8 +3072,7 @@ Returns:
 
     if (NULL != ProcessBuffer) {
       gBS->FreePool (ProcessBuffer);
-    }
-
+    }
 
     AsyncRequestPtr = NextPtr;
   }