Fix possible double free and possible memory leak while creating an ipdbg hub. Change-Id: I6254663c27c4f38d46008c4dbff11aa27b84f399 Signed-off-by: Daniel Anselmi <danselmi@gmx.ch> Reviewed-on: https://review.openocd.org/c/openocd/+/8085 Tested-by: jenkins Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>