elm: Removed unnecessary null check for ecore_timer_del,

elm: Removed unnecessary null check for ecore_timer_del,
 ecore_animator_del, and ecore_job_del.

As all efl public free apis get null as valid parameter, we do not need
to check null. I also removed some null check for other free apis which
were right next to timer/animator/job del. After this job code got
cleaner.