partitioning: pass along reference to parent when uninitializing.

* Fixes problems with setting the partition name after uninitializing
  a partition in DriveSetup. Previously, UninitializeJob() was
  followed by SetStringJob(), but the kernel was updating the
  change counter for the parent partition when uninitializing a
  partition, leading to SetStringJob() having an incorrect change
  counter for the parent partition. Now the parent change counter
  will be correct when SetStringJob() runs.

src/kits/storage/disk_device/DiskDeviceJobGenerator.cpp

@@ -523,7 +523,15 @@ DiskDeviceJobGenerator::_GenerateUninitializeJob(BPartition* partition)
 	if (error != B_OK)
 		return error;
 
-	return _AddJob(new(nothrow) UninitializeJob(reference));
+	BPartition* parent = partition->Parent();
+	PartitionReference* parentReference = NULL;
+	if (parent != NULL) {
+		error = _GetPartitionReference(parent, parentReference);
+		if (error != B_OK)
+			return error;
+	}
+
+	return _AddJob(new(nothrow) UninitializeJob(reference, parentReference));
 }