create returns an `int256` instead of an `address`.

foo.se
```
def foo():
    return(1)
```

bar.se
```
def bar():
    return(create('foo.se'): address)
```

Command:
```
serpent mk_signature bar.se
```

Result:
```
Warning: function return type inconsistent!
extern bar.se: [bar:[]:]
```