ata: remove superfluous casts

Unreferenced casts of void * types are unnecessary so remove them.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
index 7985ae7..6bd4f66 100644
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -1636,7 +1636,7 @@
 	}
 
 	if (irq_stat & PORT_IRQ_UNK_FIS) {
-		u32 *unk = (u32 *)(pp->rx_fis + RX_FIS_UNK);
+		u32 *unk = pp->rx_fis + RX_FIS_UNK;
 
 		active_ehi->err_mask |= AC_ERR_HSM;
 		active_ehi->action |= ATA_EH_RESET;