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* include/refcount.h (refcount_init): There must be at least one
reference at initialization time.
(refcounts_init): Likewise.
(refcount_unsafe_ref): New function retaining the previous
functionality of refcount_ref. It is occasionally useful to raise the
reference count again after it dropped to zero.
(refcounts_unsafe_ref): Likewise.
(refcounts_unsafe_weak_ref): Likewise.
(refcount_ref): Detect use-after-free errors.
(refcounts_ref): Likewise.
(refcounts_ref_weak): Likewise.
* libtrivfs/protid-clean.c (trivfs_clean_protid): Use refcount_unsafe_ref.
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