fixup! askrene: reservation implementation.

plugins/askrene/reserve.c

@@ -93,9 +93,8 @@ size_t reserves_add(struct reserve_hash *reserved,
 		if (!r)
 			r = new_reserve(reserved, &scidds[i]);
 		if (!add(r, amounts[i])) {
-			if (i > 0)
-				reserves_remove(reserved, scidds, amounts, i-1);
-			return false;
+			reserves_remove(reserved, scidds, amounts, i);
+			return i;
 		}
 	}
 	return num;
@@ -111,9 +110,8 @@ size_t reserves_remove(struct reserve_hash *reserved,
 	for (size_t i = 0; i < num; i++) {
 		struct reserve *r = reserve_hash_get(reserved, &scidds[i]);
 		if (!r || !remove(r, amounts[i])) {
-			if (i > 0)
-				reserves_add(reserved, scidds, amounts, i-1);
-			return false;
+			reserves_add(reserved, scidds, amounts, i);
+			return i;
 		}
 		if (r->num_htlcs == 0)
 			del_reserve(reserved, r);