cfg: remove whitespace

Change-Id: I20edbb50efc03711195102f4c6dc8bcfaf043d44
Signed-off-by: Spencer Oliver <spen@spen-soft.co.uk>
Reviewed-on: http://openocd.zylin.com/1374
Tested-by: jenkins
Reviewed-by: Peter Stuge <peter@stuge.se>