detect: remove unused flow_locked hint

src/detect.c

@@ -1734,9 +1734,7 @@ TmEcode Detect(ThreadVars *tv, Packet *p, void *data, PacketQueue *pq, PacketQue
     }
 
     if (p->flow) {
-        det_ctx->flow_locked = 1;
         DetectFlow(tv, de_ctx, det_ctx, p);
-        det_ctx->flow_locked = 0;
     } else {
         DetectNoFlow(tv, de_ctx, det_ctx, p);
     }

src/detect.h

@@ -838,10 +838,6 @@ typedef struct DetectEngineThreadCtx_ {
     /* counter for the filestore array below -- up here for cache reasons. */
     uint16_t filestore_cnt;
 
-    /* bool to hint the POSTMATCH list members about the lock status of the
-     * flow. If locked this is TRUE, unlocked or no-flow: FALSE */
-    uint8_t flow_locked;
-
     HttpReassembledBody *hsbd;
     uint64_t hsbd_start_tx_id;
     uint16_t hsbd_buffers_size;