nfsd: minor write_pool_threads exit cleanup

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index 48da164..b51e7ae 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -784,11 +784,7 @@
 		size -= len;
 		mesg += len;
 	}
-
-	kfree(nthreads);
-	mutex_unlock(&nfsd_mutex);
-	return (mesg-buf);
-
+	rv = mesg - buf;
 out_free:
 	kfree(nthreads);
 	mutex_unlock(&nfsd_mutex);