vfs: switch i_dentry/d_alias to hlist

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index 094789f..8ca2555 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -128,7 +128,7 @@
 	 	struct rcu_head d_rcu;
 	} d_u;
 	struct list_head d_subdirs;	/* our children */
-	struct list_head d_alias;	/* inode alias list */
+	struct hlist_node d_alias;	/* inode alias list */
 };
 
 /*