poll: Fix two indention

Spotted during code inspection.

Signed-off-by: Asias He <asias@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>
loader: remove unused extern declaration

This is no longer used after 1146a63e26af89df1e640b954cff5be46ef6224d.

Signed-off-by: Zifei Tong <zifeitong@gmail.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>