lib/krb5: fallback_get_hosts free addrinfo if gTLD collision or error

If getaddrinfo() succeeds and returns the gTLD name collision
address the result is ignored but the allocated addrinfo was not
freed.

If allocation of the krb5_krbhst_info structure fails the addrinfo
would also be leaked.

Change-Id: I94111e081cba9548f57ad7b7e7cbea3faab7502c

lib/krb5/krbhst.c

@@ -562,6 +562,7 @@ fallback_get_hosts(krb5_context context, struct krb5_krbhst_data *kd,
 			   "Realm %s needs immediate attention "
 			   "see https://icann.org/namecollision",
 			   kd->realm);
+		freeaddrinfo(ai);
 		return KRB5_KDC_UNREACH;
 	    }
 	}
@@ -570,6 +571,7 @@ fallback_get_hosts(krb5_context context, struct krb5_krbhst_data *kd,
 	hi = calloc(1, sizeof(*hi) + hostlen);
 	if(hi == NULL) {
 	    free(host);
+	    freeaddrinfo(ai);
 	    return krb5_enomem(context);
 	}