dnsapi: Transform two for loops into while loops.

dlls/dnsapi/ns_name.c

@@ -103,7 +103,7 @@ dns_ns_name_ntop(const u_char *src, char *dst, size_t dstsiz) {
 		if (dn + n >= eom) {
 			return (-1);
 		}
-		for ((void)NULL; n > 0; n--) {
+		while (n-- > 0) {
 			c = *cp++;
 			if (special(c)) {
 				if (dn + 1 >= eom) {

dlls/dnsapi/ns_parse.c

@@ -74,7 +74,7 @@ static int
 dns_ns_skiprr(const u_char *ptr, const u_char *eom, ns_sect section, int count) {
 	const u_char *optr = ptr;
 
-	for ((void)NULL; count > 0; count--) {
+	while (count-- > 0) {
 		int b, rdlength;
 
 		b = dn_skipname(ptr, eom);