ISDN: Fix compile error w/o CONFIG_ISDN_PPP_MP

The proto argument is not used, so just remove it from ippp*_xmit()
calls - in particular we passed it to ippp_xmit() when
CONFIG_ISDN_PPP_MP was off, which never wanted it anyway, causing
a compile error.

drivers/isdn/i4l/isdn_ppp.c

@@ -1037,7 +1037,7 @@ isdn_ppp_start_xmit(struct sk_buff *skb, struct net_device *ndev)
                 isdn_ppp_frame_log("xmit1", skb->data, skb->len, 32, ipppd->unit, -1);
 
 	ippp_push_proto(ind_ppp, skb, proto);
-	ippp_mp_xmit(idev, skb, proto);
+	ippp_mp_xmit(idev, skb);
 	return 0;
 
  drop:

drivers/isdn/i4l/isdn_ppp_mp.c

@@ -91,12 +91,13 @@ ippp_mp_disconnected(isdn_net_dev *idev)
 }
 
 void
-ippp_mp_xmit(isdn_net_dev *idev, struct sk_buff *skb, u16 proto)
+ippp_mp_xmit(isdn_net_dev *idev, struct sk_buff *skb)
 {
 	struct ind_ppp *ind_ppp = idev->ind_priv;
 	struct inl_ppp *inl_ppp = idev->mlp->inl_priv;
 	unsigned char *p;
-	long txseq;
+	u32 txseq;
+	u16 proto;
 
 	if (!(inl_ppp->mp_cfg & SC_MP_PROT)) {
 		return ippp_xmit(idev, skb);

drivers/isdn/i4l/isdn_ppp_mp.h

@@ -19,7 +19,7 @@
 int  ippp_mp_bind(isdn_net_dev *idev);
 void ippp_mp_disconnected(isdn_net_dev *idev);
 int  ippp_mp_bundle(isdn_net_dev *idev, int val);
-void ippp_mp_xmit(isdn_net_dev *idev, struct sk_buff *skb, u16 proto);
+void ippp_mp_xmit(isdn_net_dev *idev, struct sk_buff *skb);
 void ippp_mp_receive(isdn_net_dev *idev, struct sk_buff *skb, u16 proto);
 
 #else
@@ -42,9 +42,9 @@ ippp_mp_bundle(isdn_net_dev *idev, int val)
 }
 
 static inline void
-ippp_mp_xmit(isdn_net_dev *idev, struct sk_buff *skb, u16 proto)
+ippp_mp_xmit(isdn_net_dev *idev, struct sk_buff *skb)
 {
-	ippp_xmit(idev, skb, proto);
+	ippp_xmit(idev, skb);
 }
 
 static inline void