drivers/net: Remove casts of void *

Unnecessary casts of void * clutter the code.

These are the remainder casts after several specific
patches to remove netdev_priv and dev_priv.

Done via coccinelle script (and a little editing):

$ cat cast_void_pointer.cocci
@@
type T;
T *pt;
void *pv;
@@

- pt = (T *)pv;
+ pt = pv;

Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: Sjur Brændeland <sjur.brandeland@stericsson.com>
Acked-By: Chris Snook <chris.snook@gmail.com>
Acked-by: Jon Mason <jdmason@kudzu.us>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: David Dillow <dave@thedillows.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/hamachi.c b/drivers/net/hamachi.c
index a09041a..c274b3d 100644
--- a/drivers/net/hamachi.c
+++ b/drivers/net/hamachi.c
@@ -648,13 +648,13 @@
 	ring_space = pci_alloc_consistent(pdev, TX_TOTAL_SIZE, &ring_dma);
 	if (!ring_space)
 		goto err_out_cleardev;
-	hmp->tx_ring = (struct hamachi_desc *)ring_space;
+	hmp->tx_ring = ring_space;
 	hmp->tx_ring_dma = ring_dma;
 
 	ring_space = pci_alloc_consistent(pdev, RX_TOTAL_SIZE, &ring_dma);
 	if (!ring_space)
 		goto err_out_unmap_tx;
-	hmp->rx_ring = (struct hamachi_desc *)ring_space;
+	hmp->rx_ring = ring_space;
 	hmp->rx_ring_dma = ring_dma;
 
 	/* Check for options being passed in */