multi: skip EINTR check on wakeup socket if it was closed

- Don't check errno on wakeup socket if sread returned 0 since sread
  doesn't set errno in that case.

This is a follow-up to cf7760a from several days ago which fixed
Curl_multi_wait to stop busy looping sread on the non-blocking wakeup
socket if it was closed (ie sread returns 0). Due to a logic error it
was still possible to busy loop in that case if errno == EINTR.

Closes https://github.com/curl/curl/pull/5047

0 files changed, 0 insertions, 0 deletions