atm: idt77252: Remove call to memset after dma_alloc_coherent

In commit 518a2f19
("dma-mapping: zero memory returned from dma_alloc_*"),
dma_alloc_coherent has already zeroed the memory.
So memset is not needed.
Signed-off-by: NFuqian Huang <huangfq.daxian@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/atm/idt77252.c

@@ -1379,7 +1379,6 @@ init_tsq(struct idt77252_dev *card)
 		printk("%s: can't allocate TSQ.\n", card->name);
 		return -1;
 	}
-	memset(card->tsq.base, 0, TSQSIZE);
 
 	card->tsq.last = card->tsq.base + TSQ_NUM_ENTRIES - 1;
 	card->tsq.next = card->tsq.last;