Adapt to post 7.0 filter API changes

src/vfp_brotli.c

@@ -811,7 +811,9 @@ vmod_encoder__init(VRT_CTX, struct vmod_brotli_encoder **encp,
 	}
 
 	vfp->pull = vfp_br_pull;
-	VRT_AddVFP(ctx, vfp);
+	if (VRT_AddFilter(ctx, vfp, NULL))
+		// XXX minor leak from allocations above
+		return;
 	settings->which = ENC;
 	settings->quality = quality;
 	settings->large_win = large_win;
@@ -893,7 +895,9 @@ vmod_decoder__init(VRT_CTX, struct vmod_brotli_decoder **decp,
 	}
 
 	vfp->pull = vfp_unbr_pull;
-	VRT_AddVFP(ctx, vfp);
+	if (VRT_AddFilter(ctx, vfp, NULL))
+		// XXX minor leak from allocations above
+		return;
 	settings->which = DEC;
 	settings->large_win = large_win;
 	dec->vfp = vfp;