Simplify a not-NULL check in the .match() implementation.

src/vmod_selector.c

@@ -260,7 +260,6 @@ vmod_set_match(VRT_CTX, struct vmod_selector_set *set, VCL_STRING subject)
 	CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC);
 	CHECK_OBJ_NOTNULL(set, VMOD_SELECTOR_SET_MAGIC);
 	AN(set->origo);
-	AN(set->members);
 
 	if (subject == NULL) {
 		VERR(ctx, "%s.match(): subject string is NULL", set->vcl_name);
@@ -286,6 +285,7 @@ vmod_set_match(VRT_CTX, struct vmod_selector_set *set, VCL_STRING subject)
 		subj = copy;
 		members = set->lomembers;
 	}
+	AN(members);
 
 	match = get_match_data(ctx, set, "match");
 	if ((idx = PT_Lookup(set->origo, members, subj)) == UINT_MAX) {