net/colo: fix memory double free error

The 'primary_list' and 'secondary_list' members of struct Connection
is not allocated through dynamically g_queue_new(), but we free it by using
g_queue_free(), which will lead to a double-free bug.

Reviewed-by: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>
Signed-off-by: zhanghailiang <zhang.zhanghailiang@huawei.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>

net/colo.c

@@ -147,9 +147,9 @@ void connection_destroy(void *opaque)
     Connection *conn = opaque;
 
     g_queue_foreach(&conn->primary_list, packet_destroy, NULL);
-    g_queue_free(&conn->primary_list);
+    g_queue_clear(&conn->primary_list);
     g_queue_foreach(&conn->secondary_list, packet_destroy, NULL);
-    g_queue_free(&conn->secondary_list);
+    g_queue_clear(&conn->secondary_list);
     g_slice_free(Connection, conn);
 }