Return SS_RC_INITIALIZATION_FAILED if pid file exists

Let charon return SS_RC_INITIALIZATION_FAILED if an existing pid file is found.
Starter only terminates itself if the result code of the daemon is a valid
SS_RC_* value.

src/charon/charon.c

@@ -401,7 +401,6 @@ int main(int argc, char *argv[])
 	if (check_pidfile())
 	{
 		DBG1(DBG_DMN, "charon already running (\""PID_FILE"\" exists)");
-		status = -1;
 		goto deinit;
 	}