human
Solve the following python programming problem given the following code:
@ _requires_sni 
def set_tlsext_servername_callback(self, callback) : 
    '
        Specify a callback function to be called when clients specify a server
        name.

        :param callback: The callback function.  It will be invoked with one
            argument, the Connection instance.
        ' 
    @ wraps (callback) 
    def wrapper(ssl, alert, arg) : 
        callback (Connection._reverse_mapping [ssl]) 
        return 0 
self._tlsext_servername_callback = _ffi.callback ('int (*)(const SSL *, int *, void *)', wrapper) 
    _lib.SSL_CTX_set_tlsext_servername_callback (self._context, wrapper._tlsext_servername_callback) 

    
    

    Fix the buggy line: _lib.SSL_CTX_set_tlsext_servername_callback (self._context, wrapper._tlsext_servername_callback)
assistant
#Here is Python program to fix the buggy line: _lib.

_lib.SSL_CTX_set_tlsext_servername_callback (self._context, self._tlsext_servername_callback)