refresh parent vnode when get vnode from hash table

Change-Id: I3cc042b1fcd00022bc6ba48e2a05d70f351b83de

fs/jffs2/src/vfs_jffs2.c

@@ -205,6 +205,7 @@ int VfsJffs2Lookup(struct Vnode *parentVnode, const char *path, int len, struct
             if (newVnode->data == NULL) {
                 LOS_Panic("#####VfsHashGet error#####\n");
             }
+            newVnode->parent = parentVnode;
             *ppVnode = newVnode;
             return 0;
         }