avoid a couple of perl warnings

modules/t/attributeAdaptor.t

@@ -88,7 +88,7 @@ $aa->remove_from_MiscFeature($mf);
 #
 # make sure the misc_attrib table was updated
 #
-my $count = $db->db_handle->selectall_arrayref
+$count = $db->db_handle->selectall_arrayref
   ("SELECT count(*) FROM misc_attrib " .
    "WHERE misc_feature_id = 1")->[0]->[0];
 

modules/t/densityTypeAdaptor.t

@@ -49,7 +49,7 @@ ok($dt->value_type eq 'sum');
 #
 # test fetch_all
 #
-my @dts = @{$dta->fetch_all()};
+@dts = @{$dta->fetch_all()};
 ok(@dts == 2);
 
 #