[libxslt] Fix return value of xsltRegisterExtModuleElement

[Nick Wellnhofer <nwellnhof src gnome org>]

commit 9af8ca0e0e8c7f3e53d12122ee79e21723107671
Author: Nick Wellnhofer <wellnhofer aevum de>
Date:   Tue Feb 25 15:05:20 2014 +0100

    Fix return value of xsltRegisterExtModuleElement
    
    xsltRegisterExtModuleElement returned success if xsltNewExtElement
    failed. Detected by -Wunused-but-set-variable.

 libxslt/extensions.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/libxslt/extensions.c b/libxslt/extensions.c
index 30c3368..5ad73cb 100644
--- a/libxslt/extensions.c
+++ b/libxslt/extensions.c
@@ -1622,7 +1622,7 @@ xsltRegisterExtModuleElement(const xmlChar * name, const xmlChar * URI,
                              xsltPreComputeFunction precomp,
                              xsltTransformFunction transform)
 {
-    int ret;
+    int ret = 0;
 
     xsltExtElementPtr ext;
 
@@ -1648,7 +1648,7 @@ xsltRegisterExtModuleElement(const xmlChar * name, const xmlChar * URI,
 done:
     xmlMutexUnlock(xsltExtMutex);
 
-    return (0);
+    return (ret);
 }
 
 /**