In case of some error, the USB device and firmware file are still
claimed. Make sure refcounting is properly accounted for both cases.
Change-Id: I933114f68e59280e58372c0941a0062fe96ab340
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-on: http://openocd.zylin.com/6115
Tested-by: jenkins
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>