Description of problem:
If an entity is declared in an XML file the array reference is wrong causing an access error.

Version-Release number of selected component (if applicable):
perl-XML-TreeBuilder-3.09-10

How reproducible:
Always

Steps to Reproduce:
1. Create an xml file
2. declare an entity in the XML file
3. parse file
  
Actual results:
+ xmlClean -in RELEASE-NOTES.xml -out ../xml/RELEASE-NOTES.xml -book
RELEASE-NOTES -lang en-US
Modification of non-creatable array value attempted, subscript -1 at
/usr/lib/perl5/vendor_perl/5.10.0/XML/TreeBuilder.pm line 39.

Expected results:
No error

Additional info: