fix memory errors

examples/pointer.c

@@ -274,7 +274,7 @@ static void handle_touch_up(struct wl_listener *listener, void *data) {
 static void handle_touch_down(struct wl_listener *listener, void *data) {
 	struct sample_state *sample = wl_container_of(listener, sample, touch_down);
 	struct wlr_event_touch_down *event = data;
-	struct touch_point *point = calloc(1, sizeof(struct touch_state));
+	struct touch_point *point = calloc(1, sizeof(struct touch_point));
 	point->slot = event->slot;
 	point->x = event->x_mm / event->width_mm;
 	point->y = event->y_mm / event->height_mm;

examples/touch.c

@@ -61,7 +61,7 @@ static void handle_output_frame(struct output_state *output, struct timespec *ts
 static void handle_touch_down(struct touch_state *tstate, int32_t slot,
 		double x, double y, double width, double height) {
 	struct sample_state *sample = tstate->compositor->data;
-	struct touch_point *point = calloc(1, sizeof(struct touch_state));
+	struct touch_point *point = calloc(1, sizeof(struct touch_point));
 	point->slot = slot;
 	point->x = x / width;
 	point->y = y / height;

types/wlr_cursor.c

@@ -51,6 +51,7 @@ struct wlr_cursor *wlr_cursor_init() {
 	cur->state = calloc(1, sizeof(struct wlr_cursor_state));
 	if (!cur->state) {
 		wlr_log(L_ERROR, "Failed to allocate wlr_cursor_state");
+		free(cur);
 		return NULL;
 	}