nfsd: add nfsd_inject_forget_clients

...which uses the client_lock for protection instead of client_mutex.
Also remove nfsd_forget_client as there are no more callers.

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 5f3ead0..76ecdff 100644
--- a/fs/nfsd/fault_inject.c
+++ b/fs/nfsd/fault_inject.c
@@ -135,9 +135,8 @@
 	{
 		.file     = "forget_clients",
 		.get	  = nfsd_inject_print_clients,
-		.set_val  = nfsd_inject_set,
+		.set_val  = nfsd_inject_forget_clients,
 		.set_clnt = nfsd_inject_forget_client,
-		.forget   = nfsd_forget_client,
 	},
 	{
 		.file     = "forget_locks",