[Bug 220668] x11/xinit: Incorrectly calculates $displayname used by xauth

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220668

--- Comment #9 from Vladimir Kondratyev <wulf at freebsd.org> ---
(In reply to Matthew Rezny from comment #8)
> There is an upstream commit which corrects the syntax in both regards (removes match and use of ERE syntax) but neglects the guard parenthesis.

If I run startx with -nolisten tcp option and without parenthesis applied I get
following error as expr treats -nolisten as own option:

$ /usr/local/bin/startx -- -nolisten tcp
expr: illegal option -- n
expr: usage: expr [-e] expression

This error is harmless but I dislike the message.
Other way to fix it is to place "x" before both string and regex:

if expr "x$i" : '^xvt[0-9]\+$'

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