This change fixes a regression introduced by commit
0d051238be, which contained a typo that
would cause every unrefd interval to fire only once.
Fixes#8900.
Reviewed-By: Timothy J Fontaine <tjfontaine@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-by: Trevor Norris <trev.norris@gmail.com>