Description:
------------
I have code that loops through a list of hosts.

  - The code will attempt key authentication to each host.
  - If key authentication fails, then it will attempt password authentication.
  - On hosts where key authentication is successful, sftp works OK
  - On hosts where key authentication fails, but password authentication is successful, ssh2_scp_send() has problems.
  - This example attempt to transfer the local /.ssh/known_hosts file to remote hosts.  The remote hosts already have a outdated local copy of this file that will be over-written during this process.

Reproduce code:
---------------
$HOST_LIST["192.168.1.1"] = "host1";
$HOST_LIST["192.168.1.2"] = "host2";
foreach ($HOST_LIST as $HOST => $NAME) {
    $conn = ssh2_connect($HOST);
    if (!ssh2_auth_pubkey_file(
                               $conn,
                               "root",
                               "/.ssh/id_rsa.pub",
                               "/.ssh/id_rsa")) {
        ssh2_auth_password($conn, "root", "passwd");
    }
    $sftp = ssh2_sftp($conn);
    // This call to ssh2_scp_send() does not report an
    // error, but also does not transfer the file.
    ssh2_scp_send($conn, 
                  $KNOWN_HOSTS,
                  "/.ssh/known_hosts", 
                  0644)
}

Expected result:
----------------
I expect the remote /.ssh/known_hosts file to be the same as the local /.ssh/knwon_hosts file.

Actual result:
--------------
The remote files are unchanged for hosts where ssh2_auth_pubkey_file() failed and ssh2_auth_password() succeeded.