t.rast.gapfill: Fix overwrite flag

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@70550 15284696-431f-4ddb-bdfa-cd5b030d7da7

temporal/t.rast.gapfill/t.rast.gapfill.py

@@ -184,7 +184,7 @@ def main():
             
             overwrite_flags[new_id] = False
             if new_map.map_exists() or new_map.is_in_db(dbif):
-                if not grass.overwrite:
+                if not grass.overwrite():
                         grass.fatal(_("Map with name <%s> already exists. "
                                       "Please use another base name." % (_id)))
                 else: