Clean up the working area in case writing fails.
Change the error handling paradigm to avoid duplication.
Change-Id: Ie3f95f992a98a1325428e4032a1c17346d4c9977
Signed-off-by: Andreas Färber <afaerber@suse.de>
Reviewed-on: http://openocd.zylin.com/3472
Tested-by: jenkins
Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>