NFS: fix handling of malloc failure during nfs_flush_multi()

Cleanup of the allocated list entries should not call
put_nfs_open_context() on each entry, as the context will
always be NULL, causing an oops.
Signed-off-by: NFred Isaman <iisaman@netapp.com>
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/write.c

@@ -932,7 +932,7 @@ static int nfs_flush_multi(struct inode *inode, struct list_head *head, unsigned
 	while (!list_empty(&list)) {
 		data = list_entry(list.next, struct nfs_write_data, pages);
 		list_del(&data->pages);
-		nfs_writedata_release(data);
+		nfs_writedata_free(data);
 	}
 	nfs_redirty_request(req);
 	return -ENOMEM;