variable is subsequently not used

Change-Id: I177d21c6ba9f1f2e3765feffdbf317ea375a8cfe
Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>
Reviewed-on: http://openocd.zylin.com/149


Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>