Add missing initialisation in ntdrivers/parport.i.cil-2

Missing or non-deterministic initialisation caused several memory-safety
errors. For example, the task eventually tries to access the memory
pointed to by
`irp.Tail.Overlay.__annonCompField17.__annonCompField16.CurrentStackLocation->Parameters.FilterResourceRequirements.IoResourceRequirementList`.
This member was never initialised, and could thus point anywhere.
Equally, `devobj.DeviceExtension` is used, but was not initialised.

Fixes: sosy-lab#1269

c/ntdrivers/parport.i.cil-2.c

@@ -3716,6 +3716,8 @@ NTSTATUS PptDispatchInternalDeviceControl(PDEVICE_OBJECT DeviceObject , PIRP Irp
                                     Status = -1073741789L;
                                   } else {
                                     {
+                                    PARALLEL_1284_COMMAND cmd;
+                                    Irp->AssociatedIrp.SystemBuffer = &cmd;
                                     Status = PptDeselectDevice(Extension, Irp->AssociatedIrp.SystemBuffer);
                                     }
                                   }
@@ -4757,6 +4759,7 @@ BOOLEAN PptCheckIfStlProductId(PDEVICE_EXTENSION DeviceExtension , ULONG ulDaisy
 }
 BOOLEAN PptSend1284_3Command(PDEVICE_EXTENSION DeviceExtension , UCHAR Command ) 
 { UCHAR i = __VERIFIER_nondet_char() ;
+  __VERIFIER_assume(i < 7);
   UCHAR value ;
   UCHAR newvalue ;
   UCHAR test ;
@@ -9681,8 +9684,16 @@ int main(void)
   int __BLAST_NONDET = __VERIFIER_nondet_int() ;
   int irp_choice = __VERIFIER_nondet_int() ;
   DEVICE_OBJECT devobj ;
+  d.DeviceObject = &devobj;
+  devobj.DeviceExtension = malloc(sizeof(struct _DEVICE_EXTENSION));
   s = __VERIFIER_nondet_int();
   irp.Tail.Overlay.__annonCompField17.__annonCompField16.CurrentStackLocation = malloc(4 * sizeof (IO_STACK_LOCATION));
+  for(int i = 0; i < 4; ++i)
+  {
+    irp.Tail.Overlay.__annonCompField17.__annonCompField16.CurrentStackLocation[i].
+      Parameters.FilterResourceRequirements.IoResourceRequirementList =
+      malloc(sizeof(struct _IO_RESOURCE_REQUIREMENTS_LIST));
+  }
   /* ensure a bounded number of subsequent decrements do not result in stack underflow */
   irp.Tail.Overlay.__annonCompField17.__annonCompField16.CurrentStackLocation += 3;