Bug 21395: Remove 'variable $DEBUG masks earlier declaration in same scope' warning
% prove t/db_dependent/Serials.t
t/db_dependent/Serials.t .. 8/49 "my" variable $DEBUG masks earlier declaration in same scope at /kohadevbox/koha/C4/Barcodes/ValueBuilder.pm line 45.
"my" variable $DEBUG masks earlier declaration in same scope at /kohadevbox/koha/C4/Barcodes/ValueBuilder.pm line 87.
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>