NLM: Remove unused argument from svc_addsock() function

Clean up: The svc_addsock() function no longer uses its "proto"
argument, so remove it.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Cc: Neil Brown <neilb@suse.de>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index 862dff5..97543df 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -614,7 +614,7 @@
 			return -EINVAL;
 		err = nfsd_create_serv();
 		if (!err) {
-			err = svc_addsock(nfsd_serv, fd, buf, NULL);
+			err = svc_addsock(nfsd_serv, fd, buf);
 			if (err >= 0) {
 				err = lockd_up();
 				if (err < 0)