stick to convention of "retval" being used as error value to
be propagated and use "flash_flags" local variable for flash
flags read from how.
Change-Id: I63f1f2248b4f4538d6cd7634ae277f7c0aadc346
Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>
Reviewed-on: http://openocd.zylin.com/178
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>