nfs: add __acquires and __releases annotations to seqfile start/stop routines

To make sparse happy...

Signed-off-by: Jeff Layton <jlayton@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index 6a4f366..8052020 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -1252,6 +1252,7 @@
  * set up the iterator to start reading from the server list and return the first item
  */
 static void *nfs_server_list_start(struct seq_file *m, loff_t *_pos)
+				__acquires(&nn->nfs_client_lock)
 {
 	struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
 
@@ -1274,6 +1275,7 @@
  * clean up after reading from the transports list
  */
 static void nfs_server_list_stop(struct seq_file *p, void *v)
+				__releases(&nn->nfs_client_lock)
 {
 	struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);
 
@@ -1326,6 +1328,7 @@
  * set up the iterator to start reading from the volume list and return the first item
  */
 static void *nfs_volume_list_start(struct seq_file *m, loff_t *_pos)
+				__acquires(&nn->nfs_client_lock)
 {
 	struct nfs_net *nn = net_generic(seq_file_net(m), nfs_net_id);
 
@@ -1348,6 +1351,7 @@
  * clean up after reading from the transports list
  */
 static void nfs_volume_list_stop(struct seq_file *p, void *v)
+				__releases(&nn->nfs_client_lock)
 {
 	struct nfs_net *nn = net_generic(seq_file_net(p), nfs_net_id);