Fix potential use-after-free and memory leak
In function wait_for_async(), allocated async fds is freed if `SSL_get_all_async_fds` fails, but later `fds` is used. Interestingly, it is not freed when everything succeeds. Rewrite the FD set loop to make it more readable and to not modify the allocated pointer so it can be freed. Reviewed-by: NAndy Polyakov <appro@openssl.org> Reviewed-by: NPaul Dale <paul.dale@oracle.com> (Merged from https://github.com/openssl/openssl/pull/3992)
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