SUNRPC: Add an rpc_credop callback for binding a credential to an rpc_task

We need the ability to treat 'generic' creds specially, since they want to
bind instances of the auth cred instead of binding themselves.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/net/sunrpc/auth_unix.c b/net/sunrpc/auth_unix.c
index b763710..04e936a 100644
--- a/net/sunrpc/auth_unix.c
+++ b/net/sunrpc/auth_unix.c
@@ -237,6 +237,7 @@
 const struct rpc_credops unix_credops = {
 	.cr_name	= "AUTH_UNIX",
 	.crdestroy	= unx_destroy_cred,
+	.crbind		= rpcauth_generic_bind_cred,
 	.crmatch	= unx_match,
 	.crmarshal	= unx_marshal,
 	.crrefresh	= unx_refresh,