Small patch for xserver

[Kean Johnston]

Hi,

Attached is a small patch for the X server I would dearly like to see
go in before 7.2. It checks for a NULL return before calling a function
with the NULL list, which causes a SIGSEGV, which can leave the console
truly hosed.

Kean
-- 
Deckard: "I don't work here anymore. Give it to Holden. He's good."
Bryant : "I did. He can breathe okay as long as nobody unplugs him."
       --- Bladerunner
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