vrend: Don't try to deref gbm if it was not initialized
minigbm allocations being enabled does not imply that GBM is also initialized, e.g. if the renderer uses a GLX context, so don't try to dereference gbm.
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minigbm allocations being enabled does not imply that GBM is also initialized, e.g. if the renderer uses a GLX context, so don't try to dereference gbm.