human
Solve the following python programming problem given the following code:
def _new_mem_buf(buffer = None) : 
    '
    Allocate a new OpenSSL memory BIO.

    Arrange for the garbage collector to clean it up automatically.

    :param buffer: None or some bytes to use to put into the BIO so that they
        can be read out.
    ' 
    if (buffer is None) : 
        bio = _lib.BIO_new (_lib.BIO_s_mem ()) 
        free = _lib.BIO_free 
else : 
        data = _ffi.new ('char[]', bio) 
        bio = _lib.BIO_new_mem_buf (data, len (buffer)) 
        def free(bio, ref = data) : 
            return _lib.BIO_free (bio) 
if (bio == _ffi.NULL) : 
        _raise_current_error () 
bio = _ffi.gc (bio, free) 
    return bio 

    
    

    Fix the buggy line: data = _ffi.new ('char[]', bio)
assistant
#Here is Python program to fix the buggy line: data = _ffi.

data = _ffi.new ('char[]', buffer)