[gtk] vulkancontext: Add missing error switch

[Timm Bäder <baedert src gnome org>]

commit ce3d5fcb0a14e93d815dea68e124e03cc852e837
Author: Timm Bäder <mail baedert org>
Date:   Tue Nov 13 15:28:28 2018 +0100

    vulkancontext: Add missing error switch

 gdk/gdkvulkancontext.c | 5 +++++
 1 file changed, 5 insertions(+)
---
diff --git a/gdk/gdkvulkancontext.c b/gdk/gdkvulkancontext.c
index 1546f9d01c..f93997c23e 100644
--- a/gdk/gdkvulkancontext.c
+++ b/gdk/gdkvulkancontext.c
@@ -190,6 +190,11 @@ gdk_vulkan_strerror (VkResult result)
     case VK_ERROR_FRAGMENTATION_EXT:
       return "A descriptor pool creation has failed due to fragmentation";
 #endif
+#if VK_HEADER_VERSION >= 89
+    case VK_ERROR_INVALID_DRM_FORMAT_MODIFIER_PLANE_LAYOUT_EXT:
+      return "Invalid DRM format modifier plane layout";
+#endif
+
     case VK_RESULT_RANGE_SIZE:
     case VK_RESULT_MAX_ENUM:
     default: