Calling another increment/decrement if add() return FALSE.
Calling another increment/decrement if add() return FALSE.

Signed-off-by: tianhe1986 <281d452b19a59ed794600af3f9379854f1230d4f@163.com>

madwings/InsaneDB,tianhe1986/CodeIgniter,butane/CodeIgniter,tianhe1986/CodeIgniter,ytetsuro/CodeIgniter,bcit-ci/CodeIgniter,asmdigital/CodeIgniter,asmdigital/CodeIgniter,kamaslau/BasicCodeIgniter,butane/CodeIgniter,butane/CodeIgniter,ytetsuro/CodeIgniter,madwings/InsaneDB,ytetsuro/CodeIgniter,jim-parry/CodeIgniter,bcit-ci/CodeIgniter,jim-parry/CodeIgniter,madwings/InsaneDB,tianhe1986/CodeIgniter,bcit-ci/CodeIgniter,madwings/InsaneDB,asmdigital/CodeIgniter,asmdigital/CodeIgniter,ytetsuro/CodeIgniter,ytetsuro/CodeIgniter,kamaslau/BasicCodeIgniter,tianhe1986/CodeIgniter,butane/CodeIgniter,asmdigital/CodeIgniter,jim-parry/CodeIgniter,bcit-ci/CodeIgniter,tianhe1986/CodeIgniter,jim-parry/CodeIgniter,butane/CodeIgniter,madwings/InsaneDB,jim-parry/CodeIgniter,kamaslau/BasicCodeIgniter,kamaslau/BasicCodeIgniter,bcit-ci/CodeIgniter