fixes warnings. Change-Id: I1a9ec09083d4e6269889fb79e6121f25e83eb396 Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com> Reviewed-on: http://openocd.zylin.com/163 Tested-by: jenkins Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>tags/v0.6.0-rc1