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repository: make cleanup safe for re-use with grafts#6600
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We are allowed to call `git_repository__cleanup` multiple times, and thishappens e.g. in rugged if we want to free up resources before GC gets around tothem.This means that we cannot leave dangling pointers in it, which we were doingwith the grafts. Fix this by setting the pointers to NULL after freeing the resources.
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We are allowed to call
git_repository__cleanupmultiple times, and this happens e.g. in rugged if we want to free up resources before GC gets around to them.This means that we cannot leave dangling pointers in it, which we were doing with the grafts. Fix this by setting the pointers to NULL after freeing the resources.
I discovered this while working onlibgit2/rugged#964 trying to update the bindings.