human
Solve the following python programming problem given the following code:
def require_creds(use_slice_urn) : 
    'Decorator to verify credentials' 
    def require_creds(func, * args, **kw) : 
        logger.debug ('Checking creds') 
        client_cert = kw ['request'].META ['SSL_CLIENT_CERT'] 
        if use_slice_urn : 
            slice_urn = args [0] 
            credentials = args [1] 
else : 
            slice_urn = None 
            credentials = args [0] 
cred_verifier = CredentialVerifier (settings.GCF_X509_TRUSTED_CERT_DIR) 
        cred_verifier.verify_from_strings (client_cert, credentials, slice_urn, PRIVS_MAP [func.func_name]) 
        logger.debug ('Creds pass') 
        return func (* args, ** kw) 
return decorator (use_slice_urn) 

    
    

    Fix the buggy line: return decorator (use_slice_urn)
assistant
#Here is Python program to fix the buggy line: return decorator (use_slice_urn)
.

return decorator (def require_creds()