drm/kms: typo fix

I believe this is a typo.

Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 9c92461..dc8e374 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -707,7 +707,7 @@
 
 		if (crtc->fb == fb_helper->crtc_info[i].mode_set.fb) {
 			mutex_lock(&dev->mode_config.mutex);
-			ret = crtc->funcs->set_config(&fb_helper->crtc_info->mode_set);
+			ret = crtc->funcs->set_config(&fb_helper->crtc_info[i].mode_set);
 			mutex_unlock(&dev->mode_config.mutex);
 			if (ret)
 				return ret;