fixup! libplugin: Remove presplitter from the API

plugins/libplugin-pay.c

@@ -2911,7 +2911,10 @@ static struct routehints_data *routehint_data_init(struct payment *p)
 			 * payments to have fairly diverse initial
 			 * routehints.
 			 */
-			d->base = (p->partid - 1) % num_routehints;
+			if (num_routehints == 0)
+				d->base = 0;
+			else
+				d->base = (p->partid - 1) % num_routehints;
 		}
 		return d;
 	} else {