Avoid NULL dev_priv->vlv_pctx-> deref in a WARN check on Lenovo B50-30,
add an additional check for the NULL dev_priv->vlv_pctx. System now boots (though does not recognise any of the USB(3) ports) pullup#7
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@ -3625,6 +3625,8 @@ static void valleyview_check_pctx(struct drm_i915_private *dev_priv)
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{
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unsigned long pctx_addr = I915_READ(VLV_PCBR) & ~4095;
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if (WARN_ON(!dev_priv->vlv_pctx))
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return;
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WARN_ON(pctx_addr != dev_priv->mm.stolen_base +
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dev_priv->vlv_pctx->stolen->start);
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}
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