Staging: kpc2000: Cleanup in kpc_dma_transfer()

Remove unnecessary typecast in kzalloc function. In addition to that
replace kzalloc(sizeof(*acd)) over kzalloc(sizeof(struct aio_cb_data))
to maintain Linux kernel style.

Issue suggested by Coccinelle.
Signed-off-by: Madhumitha Prabakaran <madhumithabiw@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/kpc2000/kpc_dma/fileops.c

@@ -57,7 +57,7 @@ int  kpc_dma_transfer(struct dev_private_data *priv, struct kiocb *kcb, unsigned
 	
 	dev_dbg(&priv->ldev->pldev->dev, "kpc_dma_transfer(priv = [%p], kcb = [%p], iov_base = [%p], iov_len = %ld) ldev = [%p]\n", priv, kcb, (void*)iov_base, iov_len, ldev);
 	
-	acd = (struct aio_cb_data *) kzalloc(sizeof(struct aio_cb_data), GFP_KERNEL);
+	acd = kzalloc(sizeof(*acd), GFP_KERNEL);
 	if (!acd){
 		dev_err(&priv->ldev->pldev->dev, "Couldn't kmalloc space for for the aio data\n");
 		return -ENOMEM;