chore(group): add some missing assertions (#5941)

src/core/lv_group.c

@@ -71,6 +71,8 @@ lv_group_t * lv_group_create(void)
 
 void lv_group_del(lv_group_t * group)
 {
+    LV_ASSERT_NULL(group);
+
     /*Defocus the currently focused object*/
     if(group->obj_focus != NULL) {
         lv_event_send(*group->obj_focus, LV_EVENT_DEFOCUSED, get_indev(group));
@@ -216,6 +218,8 @@ void lv_group_remove_obj(lv_obj_t * obj)
 
 void lv_group_remove_all_objs(lv_group_t * group)
 {
+    LV_ASSERT_NULL(group);
+
     /*Defocus the currently focused object*/
     if(group->obj_focus != NULL) {
         lv_event_send(*group->obj_focus, LV_EVENT_DEFOCUSED, get_indev(group));
@@ -267,6 +271,8 @@ void lv_group_focus_obj(lv_obj_t * obj)
 
 void lv_group_focus_next(lv_group_t * group)
 {
+    LV_ASSERT_NULL(group);
+
     bool focus_changed = focus_next_core(group, _lv_ll_get_head, _lv_ll_get_next);
     if(group->edge_cb) {
         if(!focus_changed)
@@ -276,6 +282,8 @@ void lv_group_focus_next(lv_group_t * group)
 
 void lv_group_focus_prev(lv_group_t * group)
 {
+    LV_ASSERT_NULL(group);
+
     bool focus_changed = focus_next_core(group, _lv_ll_get_tail, _lv_ll_get_prev);
     if(group->edge_cb) {
         if(!focus_changed)
@@ -285,6 +293,8 @@ void lv_group_focus_prev(lv_group_t * group)
 
 void lv_group_focus_freeze(lv_group_t * group, bool en)
 {
+    LV_ASSERT_NULL(group);
+
     if(en == false) group->frozen = 0;
     else group->frozen = 1;
 }
@@ -301,11 +311,15 @@ lv_res_t lv_group_send_data(lv_group_t * group, uint32_t c)
 
 void lv_group_set_focus_cb(lv_group_t * group, lv_group_focus_cb_t focus_cb)
 {
+    LV_ASSERT_NULL(group);
+
     group->focus_cb = focus_cb;
 }
 
 void lv_group_set_edge_cb(lv_group_t * group, lv_group_edge_cb_t edge_cb)
 {
+    LV_ASSERT_NULL(group);
+
     group->edge_cb = edge_cb;
 }
 
@@ -329,11 +343,15 @@ void lv_group_set_editing(lv_group_t * group, bool edit)
 
 void lv_group_set_refocus_policy(lv_group_t * group, lv_group_refocus_policy_t policy)
 {
+    LV_ASSERT_NULL(group);
+
     group->refocus_policy = policy & 0x01;
 }
 
 void lv_group_set_wrap(lv_group_t * group, bool en)
 {
+    LV_ASSERT_NULL(group);
+
     group->wrap = en ? 1 : 0;
 }
 
@@ -371,6 +389,8 @@ bool lv_group_get_wrap(lv_group_t * group)
 
 uint32_t lv_group_get_obj_count(lv_group_t * group)
 {
+    LV_ASSERT_NULL(group);
+
     return _lv_ll_get_len(&group->obj_ll);
 }
 /**********************
@@ -379,6 +399,8 @@ uint32_t lv_group_get_obj_count(lv_group_t * group)
 
 static void lv_group_refocus(lv_group_t * g)
 {
+    LV_ASSERT_NULL(g);
+
     /*Refocus must temporarily allow wrapping to work correctly*/
     uint8_t temp_wrap = g->wrap;
     g->wrap           = 1;
@@ -394,6 +416,8 @@ static void lv_group_refocus(lv_group_t * g)
 static bool focus_next_core(lv_group_t * group, void * (*begin)(const lv_ll_t *),
                             void * (*move)(const lv_ll_t *, const void *))
 {
+    LV_ASSERT_NULL(group);
+
     bool focus_changed = false;
     if(group->frozen) return focus_changed;