asfdemux: simplify log statement
asfdemux: simplify log statement

Use the GST_PTR_FORMAT to print the buffer

Kurento/gst-plugins-ugly,GrokImageCompression/gst-plugins-ugly,StreamUtils/gst-plugins-ugly,GrokImageCompression/gst-plugins-ugly,freedesktop-unofficial-mirror/gstreamer__gst-plugins-ugly,GrokImageCompression/gst-plugins-ugly,freedesktop-unofficial-mirror/gstreamer__gst-plugins-ugly,sebras/gst-plugins-ugly,shelsonjava/gst-plugins-ugly,shelsonjava/gst-plugins-ugly,StreamUtils/gst-plugins-ugly,GStreamer/gst-plugins-ugly,Kurento/gst-plugins-ugly,GStreamer/gst-plugins-ugly,Kurento/gst-plugins-ugly,StreamUtils/gst-plugins-ugly,shelsonjava/gst-plugins-ugly,sebras/gst-plugins-ugly,freedesktop-unofficial-mirror/gstreamer__gst-plugins-ugly,GStreamer/gst-plugins-ugly,sebras/gst-plugins-ugly