[PATCH] dri2: Fix detection of wrong prime_id in GetScreenPrime.

[Keith Packard]

Michal Srb <msrb at suse.com> writes:

> Checking the iterating variable ("slave") against null can not detect if the
> xorg_list_for_each_entry finished without break being invoked - slave variable
> will be always non-null. This caused segfault whenever someone tried to use
> DRI_PRIME with incorrect id while having at least one render offloading slave
> configured.
>
> Restructurize the GetScreenPrime to work as expected.

Merged with review.
   c08d2b8..3dba171  master -> master

-- 
keith.packard at intel.com
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