Revert "NFS: remove BUG possibility in nfs4_open_and_get_state"

This reverts commit f39c0104.

fs/nfs/nfs4proc.c

@@ -2233,13 +2233,9 @@ static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
 	ret = _nfs4_proc_open(opendata);
 	if (ret != 0) {
 		if (ret == -ENOENT) {
-			dentry = opendata->dentry;
-			if (dentry->d_inode)
-				d_delete(dentry);
-			else if (d_unhashed(dentry))
-				d_add(dentry, NULL);
-
-			nfs_set_verifier(dentry,
+			d_drop(opendata->dentry);
+			d_add(opendata->dentry, NULL);
+			nfs_set_verifier(opendata->dentry,
 					 nfs_save_change_attribute(opendata->dir->d_inode));
 		}
 		goto out;