Remove d_drop() at dentry revalidate: the callers know when

the d_drop is appropriate.

fs/nfs/dir.c

@@ -566,7 +566,6 @@ static int nfs_lookup_revalidate(struct dentry * dentry, int flags)
 			goto out_valid;
 		shrink_dcache_parent(dentry);
 	}
-	d_drop(dentry);
 	unlock_kernel();
 	dput(parent);
 	return 0;