packet: optimize json context cleaning

We don't need to recycle the full alert array. This is going to
optimize packet recycle time.

src/decode.c

@@ -145,11 +145,12 @@ PacketAlert *PacketAlertCreate(void)
     return pa_array;
 }
 
-void PacketAlertRecycle(PacketAlert *pa_array)
+void PacketAlertRecycle(PacketAlert *pa_array, uint16_t cnt)
 {
     if (pa_array == NULL)
         return;
-    for (int i = 0; i < packet_alert_max; i++) {
+    /* Clean json content for alerts attached to the packet */
+    for (int i = 0; i < cnt; i++) {
         struct PacketContextData *current_json = pa_array[i].json_info;
         while (current_json) {
             struct PacketContextData *next_json = current_json->next;

src/decode.h

@@ -294,7 +294,7 @@ typedef struct PacketAlerts_ {
 } PacketAlerts;
 
 PacketAlert *PacketAlertCreate(void);
-void PacketAlertRecycle(PacketAlert *pa_array);
+void PacketAlertRecycle(PacketAlert *pa_array, uint16_t cnt);
 
 void PacketAlertFree(PacketAlert *pa);
 

src/packet.c

@@ -123,11 +123,12 @@ void PacketReinit(Packet *p)
     p->BypassPacketsFlow = NULL;
 #define RESET_PKT_LEN(p) ((p)->pktlen = 0)
     RESET_PKT_LEN(p);
-    p->alerts.cnt = 0;
     p->alerts.discarded = 0;
     p->alerts.suppressed = 0;
     p->alerts.drop.action = 0;
-    PacketAlertRecycle(p->alerts.alerts);
+    if (p->alerts.cnt > 0)
+        PacketAlertRecycle(p->alerts.alerts, p->alerts.cnt);
+    p->alerts.cnt = 0;
     p->pcap_cnt = 0;
     p->tunnel_rtv_cnt = 0;
     p->tunnel_tpr_cnt = 0;