drm/i915: fix oops on single crtc devices.

(regression fix since fbdev/kms rework).

My fb rework didn't remember about the 84/65s.

Reported-by: Ondrej Zary <linux@rainbow-software.org>
Tested-by: Ondrej Zary <linux@rainbow-software.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 04e1bb4..2861da3 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5470,7 +5470,6 @@
 void intel_modeset_init(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
-	int num_pipe;
 	int i;
 
 	drm_mode_config_init(dev);
@@ -5500,13 +5499,13 @@
 		dev->mode_config.fb_base = pci_resource_start(dev->pdev, 0);
 
 	if (IS_MOBILE(dev) || IS_I9XX(dev))
-		num_pipe = 2;
+		dev_priv->num_pipe = 2;
 	else
-		num_pipe = 1;
+		dev_priv->num_pipe = 1;
 	DRM_DEBUG_KMS("%d display pipe%s available.\n",
-		  num_pipe, num_pipe > 1 ? "s" : "");
+		      dev_priv->num_pipe, dev_priv->num_pipe > 1 ? "s" : "");
 
-	for (i = 0; i < num_pipe; i++) {
+	for (i = 0; i < dev_priv->num_pipe; i++) {
 		intel_crtc_init(dev, i);
 	}