xorg-x11-server: Fixes a crash when out of range DRI_PRIME is used

This update fixes the following issue with xorg-x11-server:
- bnc#846352: Fixes a crash when out of range DRI_PRIME is used

Fixed bugs
bnc#846352
DRI_PRIME with anything but 0 or 1 crashes X if rendering is offloaded
Selected Binaries
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