drm/i915: Suppress fbc suggestion to increase stolen if disabled

If the reserved region of memory has not been setup (most probably
because it has been limited by hardware or virtualisation), don't tell
the user to try and increase the amount of memory reserved for graphics.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170223122037.16174-1-chris@chris-wilson.co.ukeviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/i915/intel_fbc.c

@@ -627,6 +627,7 @@ static int intel_fbc_alloc_cfb(struct intel_crtc *crtc)
 	kfree(compressed_llb);
 	i915_gem_stolen_remove_node(dev_priv, &fbc->compressed_fb);
 err_llb:
+	if (drm_mm_initialized(&dev_priv->mm.stolen))
 		pr_info_once("drm: not enough stolen space for compressed buffer (need %d more bytes), disabling. Hint: you may be able to increase stolen memory size in the BIOS to avoid this.\n", size);
 	return -ENOSPC;
 }