[MCHANGELOG-130] NullPointerException when no SCM <url> is defined

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1388717 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/main/java/org/apache/maven/plugin/changelog/ChangeLogReport.java b/src/main/java/org/apache/maven/plugin/changelog/ChangeLogReport.java
index 1a6328b..5ed1e89 100644
--- a/src/main/java/org/apache/maven/plugin/changelog/ChangeLogReport.java
+++ b/src/main/java/org/apache/maven/plugin/changelog/ChangeLogReport.java
@@ -1488,7 +1488,7 @@
 
         if ( linkFile != null )
         {
-            if ( !scmUrl.equals( linkFile ) )
+            if ( !linkFile.equals( scmUrl) )
             {
                 // Use the given URL to create links to the files