Merge pull request aframevr#3842 from gfodor/bug/double-free-if-remove-called

Clear references to freed pooled memory to avoid double free

Author: ngokevin

src/core/component.js

@@ -678,6 +678,8 @@ function wrapRemove (removeMethod) {
     this.objectPool.recycle(this.attrValue);
     this.objectPool.recycle(this.oldData);
     this.objectPool.recycle(this.parsingAttrValue);
+
+    this.attrValue = this.oldData = this.parsingAttrValue = undefined;
   };
 }