curl: split curl_find_state/curl_init_state

curl: split curl_find_state/curl_init_state

If curl_easy_init fails, a CURLState is left with s->in_use = 1.  Split
curl_init_state in two, so that we can distinguish the two failures and
call curl_clean_state if needed.

While at it, simplify curl_find_state, removing a dummy loop.  The
aio_poll loop is moved to the sole caller that needs it.

Reviewed-by: Jeff Cody <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
Reviewed-by: Max Reitz <[email protected]>
Message-id: 20170515100059[email protected]
Signed-off-by: Jeff Cody <[email protected]>