human
Solve the following python programming problem given the following code:
@ defer.inlineCallbacks 
def get_pushers_by_app_id_and_pushkey(self, app_id, pushkey) : 
    def r(txn) : 
        sql = 'SELECT * FROM pushers WHERE app_id = ? AND pushkey = ?' 
        txn.execute (sql, (app_id, pushkey)) 
        rows = self.cursor_to_dict (txn) 
        return self._decode_pushers_rows (rows) 
rows = (yield self.runInteraction ('get_pushers_by_app_id_and_pushkey', r)) 
    defer.returnValue (pushkey) 

    
    

    Fix the buggy line: defer.returnValue (pushkey)
assistant
#Here is Python program to fix the buggy line: defer.

defer.returnValue (rows)