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Draft: tracers: leaks: fix potentially invalid memory access when trying to detect object type

Tim-Philipp Müller requested to merge tpm/gstreamer:leaks-tracer-type-checks-crashes into main

The is_gst_mini_object_check would sometimes detect a proper GObject as a mini object, and then bad things happen.

We know whether a pointer is a proper GObject or a MiniObject here though, so just pass that information to the right code paths and avoid the heuristics altogether.

There are probably more cases where the check should be eliminated.

Fixes #1334 (closed), maybe

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