Minor regression bugfix for the jtag_tap_handle_event() case

for disabling TAPs.  We don't actually know how to make any
JRCs which do that yet; but when we do, this will matter.


git-svn-id: svn://svn.berlios.de/openocd/trunk@2735 b42882b7-edfa-0310-969c-e2dbd0fdcd60