time: fix various time issues

Found by Coverity Scan.

src/flow-timeout.c

@@ -247,7 +247,6 @@ static inline Packet *FlowForceReassemblyPseudoPacketSetup(Packet *p,
                                               (uint16_t *)p->tcph, 20, 0);
     }
 
-    memset(&p->ts, 0, sizeof(struct timeval));
     p->ts = TimeGet();
 
     if (direction == 0) {

src/source-nflog.c

@@ -180,8 +180,10 @@ static int NFLOGCallback(struct nflog_g_handle *gh, struct nfgenmsg *msg,
 
     ret = nflog_get_timestamp(nfa, &p->ts);
     if (ret != 0) {
-        memset(&p->ts, 0, sizeof(struct timeval));
-        gettimeofday(&p->ts, NULL);
+        struct timeval tv;
+        memset(&tv, 0, sizeof(struct timeval));
+        gettimeofday(&tv, NULL);
+        p->ts = SCTIME_FROM_TIMEVAL(&tv);
     }
 
     p->datalink = DLT_RAW;

src/stream-tcp.c

@@ -6381,7 +6381,7 @@ static void StreamTcpPseudoPacketCreateDetectLogFlush(ThreadVars *tv,
     }
 
     /* use parent time stamp */
-    memcpy(&np->ts, &parent->ts, sizeof(struct timeval));
+    np->ts = parent->ts;
 
     SCLogDebug("np %p", np);
     PacketEnqueueNoLock(pq, np);