This patch fixes a silly bug in libcontrol.
It would complaint about column not being a control type.
There was an extra Ctltextbutton3 or similar that was set as nil
in the list of controls. So, _ctllookup would stop looking up
controls.
I changed _ctllookup not to stop on the first nil entry, to avoid this
kind of bug in the future.

I am sorry for the ugly name for the patch. I hit ESC while
sending the "libcontrolfix" patch but patch/create did send
the patch, so I couldnt recreate it with a non nil comment.

hth