Properly check for test setup errors to avoid spending time researching segfaults.
Properly check for test setup errors to avoid spending time researching
segfaults.

* test/MockHTTPinC/MockHTTP_server.c
  (initClientCtx): Return status code to allow diagnosing errors.
  (_mhRunServerLoop): Verify result of initialization.

jandre/serf,jandre/serf,jandre/serf,jandre/serf