i2c: ismt: Remove call to memset after dmam_alloc_coherent

In commit 518a2f1925c3 ("dma-mapping: zero memory returned from
dma_alloc_*"), dma_alloc_coherent has already zeroed the memory. So
memset is not needed.

Acked-by: Neil Horman <[e-mail]>
Signed-off-by: Fuqian Huang <[e-mail]>
Signed-off-by: Wolfram Sang <[e-mail]>

drivers/i2c/busses/i2c-ismt.c

···
 	if (!priv->hw)
 		return -ENOMEM;
 
-	memset(priv->hw, 0, (ISMT_DESC_ENTRIES * sizeof(struct ismt_desc)));
-
 	priv->head = 0;
 	init_completion(&priv->cmp);