Haihao Xiang fffb3f628d msdk: don't destroy an image twice
This gets rid of annoying message in the log, e.g. run the pipeline
below:

gst-launch-1.0 videotestsrc num-buffers=100 ! \
video/x-raw,format=NV12,width=352,height=288 ! msdkh264enc ! filesink \
location=test.h264

[LIBVA]:CRITICAL - DdiMedia_DestroyImage:4357: Invalid image
2019-02-24 17:59:43 +00:00
..
2018-11-12 08:00:26 +00:00
2019-02-24 17:59:43 +00:00
2018-12-17 09:12:53 +00:00
2019-02-18 15:39:43 +01:00
2019-02-18 15:39:43 +01:00