Socket I/F: Cleanup for good CONFIG_NET_PKT build.

net/pkt/Kconfig

@@ -8,6 +8,7 @@ menu "Raw Socket Support"
 config NET_PKT
 	bool "Socket packet socket support"
 	default n
+	depends on NET_ETHERNET || EXPERIMENTAL
 	---help---
 		Enable or disable support for packet sockets.
 
@@ -17,6 +18,8 @@ config NET_PKT
 		a packet socket will bypass the network altogether and be placed in
 		the transmission buffer of the network interface driver.
 
+		REVISIT: Currently only implemented for Ethernet.
+
 if NET_PKT
 
 config NET_PKT_CONNS

net/pkt/pkt_poll.c

@@ -86,7 +86,7 @@ void pkt_poll(FAR struct net_driver_s *dev, FAR struct pkt_conn_s *conn)
     {
       /* Setup for the application callback */
 
-      dev->d_appdata = &dev->d_buf[NET_LL_HDRLEN(dev) + IPv4UDP_HDRLEN];
+      dev->d_appdata = &dev->d_buf[NET_LL_HDRLEN(dev)];
       dev->d_len     = 0;
       dev->d_sndlen  = 0;
 

net/socket/bind.c

@@ -92,9 +92,6 @@
 int psock_bind(FAR struct socket *psock, const struct sockaddr *addr,
                socklen_t addrlen)
 {
-#ifdef CONFIG_NET_PKT
-  FAR const struct sockaddr_ll *lladdr = (const struct sockaddr_ll *)addr;
-#endif
   int errcode;
   int ret = OK;