correct example

src/lib/libc/string/strtok.3

@@ -33,7 +33,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.\"	$OpenBSD: strtok.3,v 1.11 2000/04/21 15:24:20 aaron Exp $
+.\"	$OpenBSD: strtok.3,v 1.12 2000/04/24 16:55:44 deraadt Exp $
 .\"
 .Dd June 29, 1991
 .Dt STRTOK 3
@@ -107,11 +107,12 @@ int i = 0;
 
 snprintf(s, sizeof(s), "cat dog horse cow");
 
-for ((p = strtok_r(s, " ", &last)); p; (p = strtok_r(NULL, " ", &last)), i++) {
-    if (i < MAXTOKENS - 1)
-        tokens[i] = p;
+for ((p = strtok_r(s, " ", &last)); p;
+    (p = strtok_r(NULL, " ", &last)), i++) {
+	if (i < MAXTOKENS - 1)
+		tokens[i] = p;
 }
-tokens[i] = '\e0';
+tokens[i] = NULL;
 .Ed
 .Pp
 That is,