I would rather give rest to Ashraful. If he hit his eid innings in warmup, then there will be nothing left for him to produce for the rest of the series.
Also as Chachu and Rahim said, Ash doesn't need to go through the boring process, for a player of his class, he should able to come and hit the eid innings from get go. Why waste time in warmup? Why take risk?
"When Soumya Sarkar shines, Bangladesh smiles!"