glupload: EGL regression with `meta->format != info->finfo->format`
Introduced by !2687 (merged)
Reproducible via
$ GST_GL_WINDOW=egl gst-launch-1.0 videotestsrc ! video/x-raw,format=I420 ! glvideomixer ! fakesink
[...]
(gst-launch-1.0:1318439): GStreamer-Video-CRITICAL **: 15:55:47.580: gst_video_frame_map_id: assertion 'info->finfo->format == meta->format' failed
0:00:00.735363225 1318439 0x55e1750dfc00 ERROR glmixer gstglmixer.c:124:gst_gl_mixer_pad_prepare_frame:<mixer:sink_0> Failed to map input frame
[...]
GLX works fine.
CC @thaytan