[pango] pango/pango-renderer.c: Fix Build

[Chun-wei Fan <fanchunwei src gnome org>]

commit 7402dfe837bde0cfc2bdb1ab30f1ce7e9822a8f7
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Fri Sep 4 16:44:22 2015 +0800

    pango/pango-renderer.c: Fix Build
    
    Some compilers insist on using a number for a guint16 return type, and does
    not like using NULL in place of 0, so fix this.

 pango/pango-renderer.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/pango/pango-renderer.c b/pango/pango-renderer.c
index a2f6ea4..9ccb771 100644
--- a/pango/pango-renderer.c
+++ b/pango/pango-renderer.c
@@ -1249,8 +1249,8 @@ guint16
 pango_renderer_get_alpha (PangoRenderer   *renderer,
                           PangoRenderPart  part)
 {
-  g_return_val_if_fail (PANGO_IS_RENDERER_FAST (renderer), NULL);
-  g_return_val_if_fail (IS_VALID_PART (part), NULL);
+  g_return_val_if_fail (PANGO_IS_RENDERER_FAST (renderer), 0);
+  g_return_val_if_fail (IS_VALID_PART (part), 0);
 
   return renderer->priv->alpha[part];
 }