The call to dap_queue_ap_write() can fail and the value in CSW and TAR becomes unknown. Invalidate the OpenOCD cache if dap_queue_ap_write() fails. Change-Id: Id6ec370b4c5ad07e454464780c1a1c8ae34ac870 Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com> Reviewed-on: http://openocd.zylin.com/4564 Tested-by: jenkins Reviewed-by: Tomas Vanek <vanekt@fbl.cz>