redirect: Make sure example application does not exit on len==0
redirect: Make sure example application does not exit on len==0

We want to continue running the event loop until it is exited properly,
not if the callback for stdin detects a short read.

Signed-off-by: Joachim Nilsson <583c295fd7602c168ad814279bbc3894ba65f5d6@gmail.com>

troglobit/libuev,troglobit/libuev