[gnome-builder] html: use return_val_if_fail

[Yosef Or Boczko <yoseforb src gnome org>]

commit 5bd96df1adea9338c19591de43b796260bdb8dbf
Author: Yosef Or Boczko <yoseforb src gnome org>
Date:   Thu Dec 11 12:51:21 2014 +0200

    html: use return_val_if_fail

 src/html/gb-html-document.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/html/gb-html-document.c b/src/html/gb-html-document.c
index 9a560af..ee972a5 100644
--- a/src/html/gb-html-document.c
+++ b/src/html/gb-html-document.c
@@ -326,8 +326,8 @@ gb_html_markdown_transform (GbHtmlDocument *document,
   GsMarkdown *md;
   gchar *str;
 
-  g_return_if_fail (GB_IS_HTML_DOCUMENT (document));
-  g_return_if_fail (content);
+  g_return_val_if_fail (GB_IS_HTML_DOCUMENT (document), NULL);
+  g_return_val_if_fail (content, NULL);
 
   md = gs_markdown_new (GS_MARKDOWN_OUTPUT_HTML);
   gs_markdown_set_autolinkify (md, TRUE);