Patch: fix weston crash

[Andrew Engelbrecht]

To produce the bug, build and run: (you don't need the game data to test)

https://github.com/clintbellanger/flare-engine/

$ mv ~/.config/flare ~/.config/flare.bak
$ ./flare  # click 'configure', set full screen mode then click 'ok'
           # weston will crash and dump core.


I've attached a patch which fixes the crashing. I mimicked the code in
the block above it without knowing the overall impact, so it needs
review from a knowledgeable contributor.

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