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e305fe971e
Previously, _kh_cancel_sub assumed that it only needed to call _km_remove if sub did not exist in subs_hash_table. This is erroneous because the complementary operation, _km_add_missing, can be called from process_kqueue_notifications, in which context sub can *only* have come from subs_hash_table. Since _km_remove is implemented using g_slist_remove, which is documented to be a noop if the list does not contain the element to be removed, it is safe to call _km_remove unconditionally here. https://bugzilla.gnome.org/show_bug.cgi?id=778515