Fixed a warning

nxy/migrate.py

@@ -20,11 +20,7 @@ def batch_insert(table, column, data):
     db.commit()
 
 
-def main(file):
-    db = sqlite3.connect(file)
+if __name__ == '__main__':
+    db = sqlite3.connect('db.sqlite' if len(sys.argv) is 0 else sys.argv[0])
     batch_insert('mcmaniacs', 'item', read_file('mcmaniac.txt'))
     batch_insert('yiffs', 'item', read_file('yiff.txt'))
-
-
-if __name__ == '__main__':
-    main('db.sqlite' if len(sys.argv) is 0 else sys.argv[0])