[chg][dfs]Clean up comments in dfs_elm_free_vnode

Removed unnecessary comments from dfs_elm_free_vnode function.

Author: Unbear-Hz

components/dfs/dfs_v2/filesystems/elmfat/dfs_elm.c

@@ -1018,14 +1018,6 @@ static struct dfs_vnode *dfs_elm_create_vnode(struct dfs_dentry *dentry, int typ
 
 static int dfs_elm_free_vnode(struct dfs_vnode *vnode)
 {
-    /* free_vnode is the backstop destruction point: called from
-       dfs_vnode_unref when ref_count drops to 0, and from dfs_vnode_destroy on
-       a create/lookup failure (ref_count == 1). Normally dfs_elm_close has
-       already released the resource and set data = NULL, so this is a no-op.
-       It only tears down the resource when close bailed out early due to
-       ref_count > 1 (a transient lookup had raised it), which is exactly the
-       leak this guards against. data != NULL means the resource is still
-       live and the lock is still initialized, so both are released here. */
     if (vnode && vnode->ref_count <= 1 && vnode->data != RT_NULL)
     {
         if (vnode->type == FT_DIRECTORY)