Although the leak is negligible, the clean heap on exit will ease valgrind testing. Change-Id: I3a7a9c8e8dc7557aa51d0b9caa244537e5e7007d Signed-off-by: Tomas Vanek <vanekt@fbl.cz> Reviewed-on: http://openocd.zylin.com/4410 Tested-by: jenkins