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gpu-kms: Don't crash if drmModeGetResources returns NULL

Aaron Plattner requested to merge aaronp24/mutter:gnome-3-28 into gnome-3-28

DRM drivers can be opened by meta_launcher_open_restricted() even if they don't implement modesetting. However, drmModeGetResources() will return NULL.

Check whether that happened in meta_gpu_kms_new() and return with an error instead of crashing.

Fixes #223 (closed).

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