versaloon: remove bogus assignment

This fixes the build with Clang 3.3.

Change-Id: I729b4791c16178cdd4a87f7e1c04019da2c84b26
Signed-off-by: Paul Fertser <fercerpav@gmail.com>
Reviewed-on: http://openocd.zylin.com/1488
Reviewed-by: Laszlo Papp <lpapp@kde.org>
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>

src/jtag/drivers/versaloon/usbtoxxx/usbtoswd.c

@@ -34,8 +34,6 @@ RESULT usbtoswd_callback(void *p, uint8_t *src, uint8_t *processed)
 {
 	struct versaloon_pending_t *pending = (struct versaloon_pending_t *)p;
 
-	processed = processed;
-
 	if (pending->extra_data != NULL)
 		*((uint8_t *)pending->extra_data) = src[0];