[PPPOL2TP]: Fix endianness annotations.

{s,d}_{session,tunnel} in pppol2tp_addr are actually host-endian
everywhere.  We might switch them to net-endian, of course, but
that structure is exposed to userland via getname...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/if_pppol2tp.h

@@ -32,8 +32,8 @@ struct pppol2tp_addr
 
 	struct sockaddr_in addr;	/* IP address and port to send to */
 
-	__be16 s_tunnel, s_session;	/* For matching incoming packets */
-	__be16 d_tunnel, d_session;	/* For sending outgoing packets */
+	__u16 s_tunnel, s_session;	/* For matching incoming packets */
+	__u16 d_tunnel, d_session;	/* For sending outgoing packets */
 };
 
 /* Socket options: