forcedeth: Remove return from a void function

In a void function, it is not necessary to append a return statement in it.

Signed-off-by: Zhu Yanjun <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ethernet/nvidia/forcedeth.c

···
 	pci_push(base);
 	writel(np->linkspeed, base + NvRegLinkSpeed);
 	pci_push(base);
-
-	return;
 }
 
 /**