Add a uint16_t control buffer type, as a union.

Then adapt the code using it. Make putting uint16_t easier in the
buffer. Pleases gcc better.

Signed-off-by: Benjamin Cama <benoar@dolka.fr>

l2tpns.h

@@ -242,7 +242,10 @@ typedef struct controls		// control message
 {
 	struct controls *next;	// next in queue
 	uint16_t length;	// length
-	uint8_t buf[MAXCONTROL];
+	union {
+		uint8_t buf[MAXCONTROL];
+		uint16_t buf16[MAXCONTROL/2];
+	} __attribute__ ((__transparent_union__));
 }
 controlt;