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vpxdec: Check that output width and height != 0

Sebastian Dröge requested to merge slomo/gst-plugins-good:vpxdec-width-zero into master

For VP8 it's possible to signal width or height to be 0, but it does not make sense to do so. For VP9 it's impossible. Hence, we most likely have a corrupt stream. Trying to negotiate caps downstream with either width or height as 0 will fail with something like

gst_video_decoder_negotiate_default: assertion 'GST_VIDEO_INFO_WIDTH (&state->info) != 0' failed

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