backend/x11: don't exit on dri3 DRM FD query failure
Even if the backend advertises dri3 support, querying the DRM FD may fail. Instead of returning early, the backend creation process must continue because shm might be supported.
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Even if the backend advertises dri3 support, querying the DRM FD may fail. Instead of returning early, the backend creation process must continue because shm might be supported.