Failure to close connection to X server

[Harald Hanche-Olsen]

I run: emacs -q -nw
Then I type: M-x make-frame-on-display RET :10 RET
When the frame appears, I type: C-x 5 0
But the connection to the X server remains open,
as shown by sockstat -4c (this is on FreeBSD).
I could try M-x close-display-connection, but it
does not recognize :10 as an open display, so
evidently there has been some attempt at closing it.

- Harald