Remove dead code, result cannot be ISC_R_SUSPEND

Remove dead code, result cannot be ISC_R_SUSPEND

    *** CID 351290:  Control flow issues  (DEADCODE)
    /lib/dns/client.c: 1027 in dns_client_resolve()
    1021     	if (!client->readydone) {
    1022     		WAIT(&client->ready, &client->readylock);
    1023     	}
    1024     	UNLOCK(&client->readylock);
    1025
    1026     	LOCK(&resarg->lock);
    >>>     CID 351290:  Control flow issues  (DEADCODE)
    >>>     Execution cannot reach the expression "result == ISC_R_SUSPEND" inside this statement: "if (result == ISC_R_SUCCESS...".
    1027     	if (result == ISC_R_SUCCESS || result == ISC_R_SUSPEND) {
    1028     		result = resarg->result;
    1029     	}
    1030     	if (result != ISC_R_SUCCESS && resarg->vresult != ISC_R_SUCCESS) {
    1031     		/*
    1032     		 * If this lookup failed due to some error in DNSSEC