- HalpXboxReadSector: Fail if we are out of memory instead of dereferencing null

- Fix for Coverity error CID: 464

svn path=/trunk/; revision=36490

reactos/hal/halx86/xbox/part_xbox.c

@@ -76,6 +76,7 @@ HalpXboxReadSector(IN PDEVICE_OBJECT DeviceObject,
                                        SectorOffset,
                                        &Event,
                                        &StatusBlock);
+    if (!Irp) return STATUS_INSUFFICIENT_RESOURCES;
 
     Status = IoCallDriver(DeviceObject,
                           Irp);