FOP-2455 - Fix unnecessary duplication of AFP resource objects as suggested by sdridi@iptech-group.com.

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@1716732 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/fop/afp/AFPResourceInfo.java

@@ -159,7 +159,7 @@ public class AFPResourceInfo {
 
         AFPResourceInfo ri = (AFPResourceInfo)obj;
         return (uri != null && uri.equals(ri.uri))
-            && (imageDimension != null && imageDimension.equals(ri.imageDimension))
+            && (imageDimension == ri.imageDimension || imageDimension != null && imageDimension.equals(ri.imageDimension))
             && (name != null && name.equals(ri.name))
             && (level != null && level.equals(ri.level));
     }