message: `CV_Assert`s changed
  Some `CV_Assert`s changed to `CV_Assert_N`s according to
diff: @@ -107,7 +107,7 @@ class XINECapture : public IVideoCapture
  bool open(const char *filename)
  {
  - CV_Assert(!xine, !stream, !vo_port);
  + CV_Assert_N(!xine, !stream, !vo_port);
  char configfile[2048] = {0};
  xine = xine_new();
  @@ -207,7 +207,7 @@ class XINECapture : public IVideoCapture
  double getProperty(int property_id) const CV_OVERRIDE
  {
  - CV_Assert(xine, vo_port, stream);
  + CV_Assert_N(xine, vo_port, stream);
  int pos_t, pos_l, length;
  bool res = (bool)xine_get_pos_length(stream, &pos_l, &pos_t, &length);
  @@ -240,7 +240,7 @@ class XINECapture : public IVideoCapture
  protected:
  bool oldSeekFrame(int f)
  {
  - CV_Assert(xine, vo_port, stream);
  + CV_Assert_N(xine, vo_port, stream);
  // no need to seek if we are already there...
  if (f == frame_number)
  {
  @@ -290,7 +290,7 @@ protected:
  bool seekFrame(int f)
  {
  - CV_Assert(xine, vo_port, stream);
  + CV_Assert_N(xine, vo_port, stream);
  if (seekable)
  {
  int new_time = (int)((f + 1) * (float)frame_duration);
  @@ -309,7 +309,7 @@ protected:
  bool seekTime(int t)
  {
  - CV_Assert(xine, vo_port, stream);
  + CV_Assert_N(xine, vo_port, stream);
  if (seekable)
  {
  if (xine_play(stream, 0, t))
  @@ -328,7 +328,7 @@ protected:
  bool seekRatio(double ratio)
  {
  - CV_Assert(xine, vo_port, stream);
  + CV_Assert_N(xine, vo_port, stream);
  if (ratio > 1 || ratio < 0)
  return false;
  if (seekable)
  