Slight change to cleanup SQL.

misc-scripts/xref_projection/project_display_xrefs.pl

@@ -717,6 +717,8 @@ sub clean_up {
 
   my ($to_dbc) = @_;
 
+  $to_dbc->do("DROP TABLE IF EXISTS tmp_gx");
+
   $to_dbc->do("CREATE TABLE tmp_gx SELECT gx.object_xref_id FROM go_xref gx LEFT JOIN object_xref ox ON ox.object_xref_id=gx.object_xref_id WHERE ox.object_xref_id IS NULL");
 
   $to_dbc->do("DELETE FROM go_xref WHERE object_xref_id IN (SELECT object_xref_id FROM tmp_gx)");