CID 351290: Control flow issues (DEADCODE)

3a650d97's removal of result = isc_app_ctxrun(client->actx); seems to be the change which triggered Coverity Scan to report this on main:

*** 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