Reworked xtensa_read_memory() logic to always allocate and initialize working buffer with sufficient padding. Signed-off-by: Ian Thompson <ianst@cadence.com> Change-Id: Ia9ab53336537adebf99f8156f481ca8279a7cd5d Reviewed-on: https://review.openocd.org/c/openocd/+/7211 Tested-by: jenkins Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com> Reviewed-by: Erhan Kurubas <erhan.kurubas@espressif.com>