human
Solve the following python programming problem given the following code:
@ staticmethod 
def check_ip_address(address, must_exist = True) : 
    ip_to_check = getattr (address, 'ip', address) 
    def _check_addr(resource) : 
        for (network, addr_list) in resource.addresses.items () : 
            for addr in addr_list : 
                if (ip_to_check == addr ['addr']) : 
                    return must_exist 
return (not must_exist) 
return ip_to_check 

    
    

    Fix the buggy line: return ip_to_check
assistant
#Here is Python program to fix the buggy line: return ip_to_check
.

return def _check_addr(