pch_dma: Reduce wasting memory

nr_channels is defined in "struct pch_dma".
and struct pch_dma_chan is defined in "struct pch_dma".
So, "sizeof(struct pch_dma_chan) * nr_channels" is unnecessary.
Signed-off-by: NTomoya MORINAGA <tomoya-linux@dsn.lapis-semi.com>
Signed-off-by: NVinod Koul <vinod.koul@linux.intel.com>

drivers/dma/pch_dma.c

@@ -872,8 +872,7 @@ static int __devinit pch_dma_probe(struct pci_dev *pdev,
 	int i;
 
 	nr_channels = id->driver_data;
-	pd = kzalloc(sizeof(struct pch_dma)+
-		sizeof(struct pch_dma_chan) * nr_channels, GFP_KERNEL);
+	pd = kzalloc(sizeof(*pd), GFP_KERNEL);
 	if (!pd)
 		return -ENOMEM;