drm/i915: Stop consulting plane->fb

We want to get rid of plane->fb on atomic drivers. Stop looking at it.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180322152313.6561-10-ville.syrjala@linux.intel.comReviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>

drivers/gpu/drm/i915/intel_display.c

@@ -2824,7 +2824,7 @@ intel_find_initial_plane_obj(struct intel_crtc *intel_crtc,
 			continue;
 
 		if (intel_plane_ggtt_offset(state) == plane_config->base) {
-			fb = c->primary->fb;
+			fb = state->base.fb;
 			drm_framebuffer_get(fb);
 			goto valid_fb;
 		}

drivers/gpu/drm/i915/intel_fbdev.c

@@ -640,7 +640,7 @@ static bool intel_fbdev_init_bios(struct drm_device *dev,
 		if (!crtc->state->active)
 			continue;
 
-		WARN(!crtc->primary->fb,
+		WARN(!crtc->primary->state->fb,
 		     "re-used BIOS config but lost an fb on crtc %d\n",
 		     crtc->base.id);
 	}