Ack, this is failing on the 32-bit build now. Why would it fail now, but not before?

```
/home/travis/build/neovim/neovim/src/os/rstream.c: In function ‘fread_idle_cb’:
/home/travis/build/neovim/neovim/src/os/rstream.c:238:3: error: comparison is always true due to limited range of data type [-Werror=type-limits]
```