found by clang 3.4. Change-Id: Id499b546f65acd7a719498bc97e33b21d1ba565a Signed-off-by: Spencer Oliver <spen@spen-soft.co.uk> Reviewed-on: http://openocd.zylin.com/2119 Tested-by: jenkins Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com> Reviewed-by: Andrey Smirnov <andrew.smirnov@gmail.com>tags/v0.8.0