Fix crash in BListValueNode.

- Don't try to create children if location resolution failed.

src/apps/debugger/value/value_nodes/BListValueNode.cpp

@@ -307,6 +307,9 @@ BListValueNode::CreateChildren()
 	if (fChildrenCreated)
 		return B_OK;
 
+	if (fLocationResolutionState != B_OK)
+		return fLocationResolutionState;
+
 	if (fItemCountType != NULL) {
 		BListItemCountNodeChild* countChild = new(std::nothrow)
 			BListItemCountNodeChild(fItemCountLocation, this, fItemCountType);