vpxdec: Skip check of key frame when open GOP
Valid stream [1] might has no key frame.
Fixed: gst-plugins-good#890 (closed)
[1] https://storage.googleapis.com/downloads.webmproject.org/test_data/libvpx/vp90-2-16-intra-only.webm
Edited by Zhao Gang
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Valid stream [1] might has no key frame.
Fixed: gst-plugins-good#890 (closed)
[1] https://storage.googleapis.com/downloads.webmproject.org/test_data/libvpx/vp90-2-16-intra-only.webm