ipc: Always initialize response struct

Response structure was not initialized completely,
when mkdtemp/chown failed, server was not accepting connection yet or
connect failed for some reason.

This is not an issue, but valgrind reports this
as a problem so it is easy to miss real problem then.

Solution is to initialize response before it is used.

Signed-off-by: Jan Friesse <jfriesse@redhat.com>