dev_poll: Simplify iv_dev_poll_notify_fd_sync().
dev_poll: Simplify iv_dev_poll_notify_fd_sync().

Considering that, on entry, fd->list_notify will always be
initialized, and fd->registered_bands will always be zero.

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

buytenh/ivykis,buytenh/ivykis