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
(cherry picked from commit 05797c45bb)

src/decode.c

@@ -446,11 +446,17 @@ 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)) {