Fixing Xref.t. Tests its working.

All tests are working. The Xref.t test is working but have a warning: " Useless use of hash element in void context at /home/bryan/Documentos/UnB/MES/analizo/lib/Analizo/Extractor/Bxref/Xref.pm line 47.". For to fix, only remove the line but will be we need it?