refactor: Make add_to_list non-recursive.

Author: iphydf

toxcore/DHT.c

@@ -601,27 +601,31 @@ bool add_to_list(
     Node_format *nodes_list, uint32_t length, const uint8_t pk[CRYPTO_PUBLIC_KEY_SIZE],
     const IP_Port *ip_port, const uint8_t cmp_pk[CRYPTO_PUBLIC_KEY_SIZE])
 {
+    uint8_t pk_cur[CRYPTO_PUBLIC_KEY_SIZE];
+    memcpy(pk_cur, pk, CRYPTO_PUBLIC_KEY_SIZE);
+    IP_Port ip_port_cur = *ip_port;
+
+    bool inserted = false;
+
     for (uint32_t i = 0; i < length; ++i) {
         Node_format *node = &nodes_list[i];
 
-        if (id_closest(cmp_pk, node->public_key, pk) == 2) {
+        if (id_closest(cmp_pk, node->public_key, pk_cur) == 2) {
             uint8_t pk_bak[CRYPTO_PUBLIC_KEY_SIZE];
             memcpy(pk_bak, node->public_key, CRYPTO_PUBLIC_KEY_SIZE);
 
             const IP_Port ip_port_bak = node->ip_port;
-            memcpy(node->public_key, pk, CRYPTO_PUBLIC_KEY_SIZE);
-
-            node->ip_port = *ip_port;
+            memcpy(node->public_key, pk_cur, CRYPTO_PUBLIC_KEY_SIZE);
 
-            if (i != length - 1) {
-                add_to_list(nodes_list, length, pk_bak, &ip_port_bak, cmp_pk);
-            }
+            node->ip_port = ip_port_cur;
 
-            return true;
+            memcpy(pk_cur, pk_bak, CRYPTO_PUBLIC_KEY_SIZE);
+            ip_port_cur = ip_port_bak;
+            inserted = true;
         }
     }
 
-    return false;
+    return inserted;
 }
 
 /**