stream: fix StreamTcpSegmentForSession missing segments

Bugfix, segment traversal was being initialized at root node, but
should have been started at the min node. Bug resulted in captures
missing segments left of root node.

src/stream-tcp.c

@@ -6452,8 +6452,8 @@ int StreamTcpSegmentForSession(
     TcpStream *server_stream = &(ssn->server);
     TcpStream *client_stream = &(ssn->client);
 
-    TcpSegment *server_node = RB_ROOT(&(server_stream->seg_tree));
-    TcpSegment *client_node = RB_ROOT(&(client_stream->seg_tree));
+    TcpSegment *server_node = RB_MIN(TCPSEG, &server_stream->seg_tree);
+    TcpSegment *client_node = RB_MIN(TCPSEG, &client_stream->seg_tree);
     if (server_node == NULL && client_node == NULL) {
         return cnt;
     }