fix an off-by-one error in url_encode_l() (count the terminating '\0')

src/url.c

@@ -43,7 +43,7 @@ enum state_e {
 size_t
 url_encode_l(size_t l)
 {
-	return l * 3;
+	return (l * 3) + 1;
 }
 
 size_t