4293. [bug] Address memory leak on priming query creation failure.

                        [RT #41512]

CHANGES

+4293.	[bug]		Address memory leak on priming query creation failure.
+			[RT #41512]
+
 4292.	[placeholder]
 
 4291.	[cleanup]	Added a required include to dns/forward.h. [RT #41474]

lib/dns/resolver.c

@@ -9054,6 +9054,7 @@ dns_resolver_prime(dns_resolver_t *res) {
 						  &res->primefetch);
 		UNLOCK(&res->primelock);
 		if (result != ISC_R_SUCCESS) {
+			isc_mem_put(res->mctx, rdataset, sizeof(*rdataset));
 			LOCK(&res->lock);
 			INSIST(res->priming);
 			res->priming = ISC_FALSE;