tevent: fd events do not work correctly for UDP socket?

[Pavel Březina]

When I connect to a port over UDP and nobody listens on the port tevent 
fires immediately read fd event even though there is no data available.

Simple reproducer is attached. Just run 'make && ./client' and see that 
read_handler is executed immediately. When there is a process listening 
(nc -ul 3333) the handler is fired only when data is available.

This probably boils down to epoll_wait but not being an epoll export, 
I'd like to ask if there is something that can be done about it or if it 
is an expected behavior.

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all: client

client: ./main.c
	gcc -ggdb3 -o client ./main.c -ltalloc -ltevent

clean:
	rm -f client