drivers/stlink_usb: check error code returned by st-link
Most of ST-Link commands return an error code, but this is almost never checked. Check for the error code for every command that returns it. Change-Id: Ifc4e32f8c73196de23700ba0989bfdfe0f5b46e3 Signed-off-by:Antonio Borneo <borneo.antonio@gmail.com> Reviewed-on: http://openocd.zylin.com/4825 Tested-by: jenkins Reviewed-by:
Tomas Vanek <vanekt@fbl.cz>
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