Florian Müllner e1ffe15d94 display: Check we have a screen before freeing it
The reason for the display to be closed may be meta_screen_new()
returning NULL, in which case we don't have a screen to free.
Avoid a segfault on exit by adding a proper check.

https://bugzilla.gnome.org/show_bug.cgi?id=778831
2017-02-19 20:56:25 +01:00
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