i40e: Remove timer and task only if created

i40e: Remove timer and task only if created

Orabug: 23176970

In some error scenarios, we may find ourselves trying to remove a
non-existent timer or worktask.  This causes the kernel some bit
of consternation, so don't do it.

Signed-off-by: Shannon Nelson <shannon.nelson@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
(cherry picked from commit c99abb4cb8227bf8172c085213c91bf155c6618a)
Signed-off-by: Brian Maly <brian.maly@oracle.com>