Add EINVAL error for epoll_create
Add EINVAL error for epoll_create

Linux standard is that epoll_create will return -1 and set errno to
EINVAL if size is not positive.

PiperOrigin-RevId: 228963509

google/asylo,google/asylo,google/asylo,google/asylo,google/asylo,google/asylo