NFSD: Replace open-coded integer with macro

Clean up: Instead of open-coding 2049, use the NFS_PORT macro.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index 498d763..856b864 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -439,9 +439,9 @@
 		rv = get_int(&mesg, &newthreads);
 		if (rv)
 			return rv;
-		if (newthreads <0)
+		if (newthreads < 0)
 			return -EINVAL;
-		rv = nfsd_svc(2049, newthreads);
+		rv = nfsd_svc(NFS_PORT, newthreads);
 		if (rv)
 			return rv;
 	}