In case of timer is set and expires:
1. timer_fd is readable and stay readable.
2. timer_fd is part of epoll_fd set. This makes epoll_pwait()
calls return immediately instead of sleeping.
Type: fix
Signed-off-by: Daniel Béreš <dberes@cisco.com>
Change-Id: I9b228464fe45b83def9b182c885d6febf428049c