vxge: remove unnecessary cast in kfree()

Remove unnecessary cast in the argument to kfree.
Signed-off-by: Xu Wang <vulab@iscas.ac.cn>
Link: https://lore.kernel.org/r/20201023085533.4792-1-vulab@iscas.ac.cnSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/neterion/vxge/vxge-config.c

@@ -1121,7 +1121,7 @@ static void __vxge_hw_blockpool_destroy(struct __vxge_hw_blockpool *blockpool)
 
 	list_for_each_safe(p, n, &blockpool->free_entry_list) {
 		list_del(&((struct __vxge_hw_blockpool_entry *)p)->item);
-		kfree((void *)p);
+		kfree(p);
 	}
 
 	return;