Fix use-after-free error in nscd (CID 1006083)

[truckman]

Summary

Coverity flagged a use-after-free error in the nscd cache_read
function. It noticed that find_res->value is getting freed
before it gets passed to memcpy(). It looks like the problem
is a missing return (-1) inside the

	    if (find_res->fifo_policy_item->last_request_time.tv_sec -
	        find_res->fifo_policy_item->creation_time.tv_sec
	        common_entry->common_params.max_lifetime.tv_sec) {

block.