destiny: fixed condition for error handling
send_tcp returns either the length of the sent data,
or -1, if an error was detected.

The current implementation checks for != 1.
This results in executing the error case, although
there was semantically no error returned from send_tcp.
Merge pull request #1280 from cgundogan/fix_send_tcp_error_check

destiny: fixed condition for error handling of send_tcp in destiny_socket_send