window: Don't unhibit with 0 cookie
The upper layers do not bother whether there's an inhibitor when calling uninhibit (and shouldn't) so don't put out out warning when called with 0 cookie.
Closes: #249 (closed)
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The upper layers do not bother whether there's an inhibitor when calling uninhibit (and shouldn't) so don't put out out warning when called with 0 cookie.
Closes: #249 (closed)