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samiparse: fix handling of self-closing tags

Tim-Philipp Müller requested to merge tpm/gstreamer:samiparse-clusterfuzz-fixes into main

We would check the wrong string (rest of line rather than element) for the / suffix of self-closing tags, which is not only wrong but also has atrocious performance with certain strings like the garbled nonsense clusterfuzz feeds us, which might cause discoverer to time out when processing garbled SAMI files.

Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=47461

Plus some clean-ups / micro-optimisations.

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