switch ->get_link() to delayed_call, kill ->put_link()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/proc/namespaces.c b/fs/proc/namespaces.c
index 63861c1..1dece87 100644
--- a/fs/proc/namespaces.c
+++ b/fs/proc/namespaces.c
@@ -31,7 +31,8 @@
 };
 
 static const char *proc_ns_get_link(struct dentry *dentry,
-				    struct inode *inode, void **cookie)
+				    struct inode *inode,
+				    struct delayed_call *done)
 {
 	const struct proc_ns_operations *ns_ops = PROC_I(inode)->ns_ops;
 	struct task_struct *task;