Fix compiler warning.

regress/sys/kern/nameibench/nameibench.c

@@ -1,4 +1,4 @@
-/*	$NetBSD: nameibench.c,v 1.1 2009/01/29 21:24:19 ad Exp $	*/
+/*	$NetBSD: nameibench.c,v 1.2 2019/11/23 20:37:05 ad Exp $	*/
 
 /*-
  * Copyright (c) 2009 The NetBSD Foundation, Inc.
@@ -103,7 +103,7 @@ makelist(void)
 static void
 lookups(int idx)
 {
-	unsigned int p, c;
+	int p, c;
 
 	for (c = 0, p = 0; !stop; c++) {
 		p += primes[idx];