Fixing manual merge error.

sql/slave.cc:
  Removing piece of code which get there when manual merging from 5.0 tree.

sql/slave.cc

@@ -2460,13 +2460,6 @@ the slave SQL thread with \"SLAVE START\". We stopped at log \
   THD_CHECK_SENTRY(thd);
   delete thd;
   pthread_mutex_unlock(&LOCK_thread_count);
-#ifndef DBUG_OFF
-  /*
-    Bug #19938 Valgrind error (race) in handle_slave_sql()
-    Read the value of rli->event_till_abort before releasing the mutex
-  */
-  const int eta= rli->events_till_abort;
-#endif
  /*
   Note: the order of the broadcast and unlock calls below (first broadcast, then unlock)
   is important. Otherwise a killer_thread can execute between the calls and