eloop: fix leaving dead FDs pollable

We used to remove dead FDs from the epoll-loop, but we should do this only
if they are no longer readable. An FD might be dead/HUP but still
readable.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>

src/eloop.c

@@ -836,7 +836,7 @@ int ev_eloop_dispatch(struct ev_eloop *loop, int timeout)
 				continue;
 
 			mask = convert_mask(ep[i].events);
-			if (mask & EV_HUP)
+			if ((mask & (EV_ERR | EV_HUP)) == mask)
 				ev_fd_disable(fd);
 
 			fd->cb(fd, mask, fd->data);