CID 436299: Null pointer dereference in lib/dns/resolver.c

Coverity Scan claims a possible null pointer dereferences in lib/dns/resolver.c (via 03127891):

/lib/dns/resolver.c: 10620 in dns_resolver_createfetch()
10614     
10615     		/* On success, the fctx is locked in get_attached_fctx() */
10616     
10617     		INSIST(!SHUTTINGDOWN(fctx));
10618     
10619     		/* Is this a duplicate? */
>>>     CID 436299:  Null pointer dereferences  (REVERSE_INULL)
>>>     Null-checking "fctx" suggests that it may be null, but it has already been dereferenced on all paths leading to the check.
10620     		if (fctx != NULL && client != NULL) {
10621     			dns_fetchresponse_t *resp = NULL;
10622     			for (resp = ISC_LIST_HEAD(fctx->resps); resp != NULL;
10623     			     resp = ISC_LIST_NEXT(resp, link))
10624     			{
10625     				if (resp->client != NULL && resp->id == id &&