As per the C++ standard, any usage of a std::set::iterator after it has
been erased from the collection results in undefined behaviour. This has
resulted in application crashes due to CUDA illegal address errors.
This commit fixes the issue by copying and incrementing the iterator
within any for-loops that also invoke std::set::erase.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8472>
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