bypass: fix memory leak - reassign of FlowBypassInfo

In some situations bypass callback is called on already bypassed
flow. This allocates FlowBypassInfo structure for the flow but
does not check if the flow already has one.

Issue: #5368

src/decode.c

@@ -452,11 +452,17 @@ void PacketBypassCallback(Packet *p)
                 (state == FLOW_STATE_CAPTURE_BYPASSED)) {
             return;
         }
-        FlowBypassInfo *fc = SCCalloc(sizeof(FlowBypassInfo), 1);
-        if (fc) {
-            FlowSetStorageById(p->flow, GetFlowBypassInfoID(), fc);
-        } else {
-            return;
+
+        FlowBypassInfo *fc;
+
+        fc = FlowGetStorageById(p->flow, GetFlowBypassInfoID());
+        if (fc == NULL) {
+            fc = SCCalloc(sizeof(FlowBypassInfo), 1);
+            if (fc) {
+                FlowSetStorageById(p->flow, GetFlowBypassInfoID(), fc);
+            } else {
+                return;
+            }
         }
     }
     if (p->BypassPacketsFlow && p->BypassPacketsFlow(p)) {