autofp: reduce flow storage space requirement

Use int16_t instead of a regular int to safe 2 bytes per flow.

src/flow.h

@@ -326,7 +326,7 @@ typedef struct Flow_
     SC_ATOMIC_DECLARE(FlowRefCount, use_cnt);
 
     /** flow queue id, used with autofp */
-    SC_ATOMIC_DECLARE(int, autofp_tmqh_flow_qid);
+    SC_ATOMIC_DECLARE(int16_t, autofp_tmqh_flow_qid);
 
     uint32_t probing_parser_toserver_alproto_masks;
     uint32_t probing_parser_toclient_alproto_masks;

src/tmqh-flow.c

@@ -229,7 +229,7 @@ void TmqhOutputFlowFreeCtx(void *ctx)
  */
 void TmqhOutputFlowRoundRobin(ThreadVars *tv, Packet *p)
 {
-    int32_t qid = 0;
+    int16_t qid = 0;
 
     TmqhFlowCtx *ctx = (TmqhFlowCtx *)tv->outctx;
 
@@ -271,7 +271,7 @@ void TmqhOutputFlowRoundRobin(ThreadVars *tv, Packet *p)
  */
 void TmqhOutputFlowActivePackets(ThreadVars *tv, Packet *p)
 {
-    int32_t qid = 0;
+    int16_t qid = 0;
 
     TmqhFlowCtx *ctx = (TmqhFlowCtx *)tv->outctx;
 
@@ -319,7 +319,7 @@ void TmqhOutputFlowActivePackets(ThreadVars *tv, Packet *p)
  */
 void TmqhOutputFlowHash(ThreadVars *tv, Packet *p)
 {
-    int32_t qid = 0;
+    int16_t qid = 0;
 
     TmqhFlowCtx *ctx = (TmqhFlowCtx *)tv->outctx;