v4l2codecs: h264: Fix typo in comment

Part-of: <gstreamer/gstreamer!1387>
21 jobs for !1387 with v4l2-h264-lt-fix in 22 minutes and 7 seconds (queued for 1 second)
detached
Status Name Job ID Coverage
  Trigger
manual trigger #16223516
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  Build Docker
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passed gst-indent amd64 docker #16223518

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  Preparation
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  Build
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  Test
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