Use a human-readable error description rather than just the error name
in log messages.
Change-Id: Iab4ff7a7e4d9993983a07eab9f462820d4ee8190
Signed-off-by: Marc Schink <openocd-dev@marcschink.de>
Reviewed-on: http://openocd.zylin.com/4212
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>