Make sure we free any memory used for gdb_save_tdesc. Change-Id: Ia226f6134318c8c6b0ac4fa20fe70a570a08d80d Signed-off-by: Spencer Oliver <spen@spen-soft.co.uk> Reviewed-on: http://openocd.zylin.com/1619 Tested-by: jenkins Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>