[gtk+] vulkan: Fix release builds

[Timm Bäder <baedert src gnome org>]

commit fb81686a897bd54c0b0eef1d45b4af72fb31f35e
Author: Timm Bäder <mail baedert org>
Date:   Sun Jan 21 15:23:17 2018 +0100

    vulkan: Fix release builds

 gdk/gdkvulkancontextprivate.h |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/gdk/gdkvulkancontextprivate.h b/gdk/gdkvulkancontextprivate.h
index 68669d3..c543f9f 100644
--- a/gdk/gdkvulkancontextprivate.h
+++ b/gdk/gdkvulkancontextprivate.h
@@ -60,7 +60,10 @@ gdk_vulkan_handle_result (VkResult    res,
                           const char *called_function)
 {
   if (res != VK_SUCCESS)
-    GDK_NOTE (VULKAN, g_printerr ("%s(): %s (%d)\n", called_function, gdk_vulkan_strerror (res), res));
+    {
+      GDK_NOTE (VULKAN, g_printerr ("%s(): %s (%d)\n", called_function, gdk_vulkan_strerror (res), res));
+    }
+
   return res;
 }