net: ppp: Remove unnecessary (void*) conversions

No need cast (void*) to (struct sock *).
Signed-off-by: Wu Yunchuan <yunchuan@nfschina.com>
Reviewed-by: Guillaume Nault <gnault@redhat.com>
Link: https://lore.kernel.org/r/20230717031115.54432-1-yunchuan@nfschina.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ppp/pppoe.c

@@ -968,7 +968,7 @@ static int __pppoe_xmit(struct sock *sk, struct sk_buff *skb)
  ***********************************************************************/
 static int pppoe_xmit(struct ppp_channel *chan, struct sk_buff *skb)
 {
-	struct sock *sk = (struct sock *)chan->private;
+	struct sock *sk = chan->private;
 	return __pppoe_xmit(sk, skb);
 }
 
@@ -976,7 +976,7 @@ static int pppoe_fill_forward_path(struct net_device_path_ctx *ctx,
 				   struct net_device_path *path,
 				   const struct ppp_channel *chan)
 {
-	struct sock *sk = (struct sock *)chan->private;
+	struct sock *sk = chan->private;
 	struct pppox_sock *po = pppox_sk(sk);
 	struct net_device *dev = po->pppoe_dev;
 

drivers/net/ppp/pptp.c

@@ -148,7 +148,7 @@ static struct rtable *pptp_route_output(const struct pppox_sock *po,
 
 static int pptp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
 {
-	struct sock *sk = (struct sock *) chan->private;
+	struct sock *sk = chan->private;
 	struct pppox_sock *po = pppox_sk(sk);
 	struct net *net = sock_net(sk);
 	struct pptp_opt *opt = &po->proto.pptp;
@@ -575,7 +575,7 @@ static int pptp_create(struct net *net, struct socket *sock, int kern)
 static int pptp_ppp_ioctl(struct ppp_channel *chan, unsigned int cmd,
 	unsigned long arg)
 {
-	struct sock *sk = (struct sock *) chan->private;
+	struct sock *sk = chan->private;
 	struct pppox_sock *po = pppox_sk(sk);
 	struct pptp_opt *opt = &po->proto.pptp;
 	void __user *argp = (void __user *)arg;