🎈 perf(pacekt and tcp_segment init): reduce memset

src/packet/packet_utils.cpp

@@ -490,7 +490,7 @@ uint16_t packet_get_payload_len(const struct packet *pkt)
 
 struct packet *packet_new(uint16_t pkt_len)
 {
-    struct packet *pkt = (struct packet *)calloc(1, sizeof(struct packet) + pkt_len);
+    struct packet *pkt = (struct packet *)malloc( sizeof(struct packet) + pkt_len);
     if (pkt == NULL)
     {
         return NULL;