iv_event_raw: Don't call perror(2) when read(2) returns zero.
iv_event_raw: Don't call perror(2) when read(2) returns zero.

Signed-off-by: Lennert Buytenhek <8858498612e3a522354216649776e3032dcb7e5b@wantstofly.org>

buytenh/ivykis,buytenh/ivykis