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gstmeta: intern registered impl string

Mathieu Duponchelle requested to merge meh/gstreamer:meta-fix-memory-access into master

Subsequent lookups in the hashtable are probably better done on memory we're confident is allocated to us :)

It was easy to trigger invalid reads by calling gst_meta_register with dynamically allocated memory, freeing that memory, then calling gst_meta_get_info()

Edited by Mathieu Duponchelle

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