vaapipostproc: intel driver add green border on odd vertical scaling with YUY2

Submitted by Thomas Scheuermann

Link to original bug (#777820)

Description

vaapipostproc creates a green colored last line if the scaling value for the height is odd. It can be shown with the following pipeline:

gst-launch-1.0 videotestsrc ! video/x-raw,width=1920,height=1080 ! vaapipostproc ! vaapih264enc ! h264parse ! decodebin ! vaapipostproc ! video/x-raw,width=861,height=411,format=I420 ! xvimagesink

Regards,
Thomas

Version: 1.10.2