Don't forget to remember previous element at the end of the loop.

Reported by:	brueffer
Found with:	Coverity Prevent(tm)
CID:		1135301

lib/libcapsicum/libcapsicum_dns.c

@@ -247,6 +247,7 @@ cap_getaddrinfo(cap_channel_t *chan, const char *hostname, const char *servname,
 			prevai->ai_next = curai;
 		else if (firstai == NULL)
 			firstai = curai;
+		prevai = curai;
 	}
 	nvlist_destroy(nvl);
 	if (curai == NULL && nvlai != NULL) {