nfsd: add a forget_clients "get" routine with proper locking

Add a new "get" routine for forget_clients that relies on the
client_lock instead of the client_mutex.

Signed-off-by: Jeff Layton <jlayton@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
diff --git a/fs/nfsd/fault_inject.c b/fs/nfsd/fault_inject.c
index b115990..a0387fd 100644
--- a/fs/nfsd/fault_inject.c
+++ b/fs/nfsd/fault_inject.c
@@ -134,11 +134,10 @@
 static struct nfsd_fault_inject_op inject_ops[] = {
 	{
 		.file     = "forget_clients",
-		.get	  = nfsd_inject_get,
+		.get	  = nfsd_inject_print_clients,
 		.set_val  = nfsd_inject_set,
 		.set_clnt = nfsd_inject_set_client,
 		.forget   = nfsd_forget_client,
-		.print    = nfsd_print_client,
 	},
 	{
 		.file     = "forget_locks",