[glsl] Be more null-safe for free/destroy functions

libs/ecs/ecs.c

@@ -46,6 +46,9 @@ ECS_NewRegistry (void)
 VISIBLE void
 ECS_DelRegistry (ecs_registry_t *registry)
 {
+	if (!registry) {
+		return;
+	}
 	registry->locked = 1;
 	for (uint32_t i = 0; i < registry->components.size; i++) {
 		__auto_type comp = &registry->components.a[i];

libs/scene/entity.c

@@ -52,6 +52,9 @@ EntQueue_New (int num_queues)
 void
 EntQueue_Delete (entqueue_t *queue)
 {
+	if (!queue) {
+		return;
+	}
 	for (int i = 0; i < queue->num_queues; i++) {
 		DARRAY_CLEAR (&queue->ent_queues[i]);
 	}

libs/util/dstring.c

@@ -83,6 +83,9 @@ dstring_new (void)
 VISIBLE void
 dstring_delete (dstring_t *dstr)
 {
+	if (!dstr) {
+		return;
+	}
 	if (dstr->str)
 		dstr->mem->free (dstr->mem->data, dstr->str);
 	dstr->mem->free (dstr->mem->data, dstr);

libs/util/hash.c

@@ -283,6 +283,9 @@ Hash_SetHashCompare (hashtab_t *tab, uintptr_t (*gh)(const void*,void*),
 VISIBLE void
 Hash_DelTable (hashtab_t *tab)
 {
+	if (!tab) {
+		return;
+	}
 	Hash_FlushTable (tab);
 	free (tab);
 }

libs/video/renderer/glsl/glsl_draw.c

@@ -168,6 +168,10 @@ make_glpic (const char *name, qpic_t *p)
 static void
 pic_free (qpic_t *pic)
 {
+	if (!pic) {
+		return;
+	}
+
 	subpic_t   *subpic = *(subpic_t **) pic->data;
 
 	GLSL_SubpicDelete (subpic);

libs/video/renderer/glsl/glsl_textures.c

@@ -394,6 +394,9 @@ GLSL_ScrapClear (scrap_t *scrap)
 void
 GLSL_DestroyScrap (scrap_t *scrap)
 {
+	if (!scrap) {
+		return;
+	}
 	scrap_t   **s;
 
 	for (s = &scrap_list; *s; s = &(*s)->next) {

libs/video/renderer/r_scrap.c

@@ -65,6 +65,9 @@ R_ScrapInit (rscrap_t *scrap, int width, int height)
 VISIBLE void
 R_ScrapDelete (rscrap_t *scrap)
 {
+	if (!scrap) {
+		return;
+	}
 	R_ScrapClear (scrap);
 	VRect_Delete (scrap->free_rects);
 }

libs/video/targets/vid.c

@@ -328,11 +328,15 @@ VID_shutdown (void *data)
 	free (viddef.palette);
 	free (viddef.palette32);
 
+	if (viddef.onPaletteChanged) {
 		DARRAY_CLEAR (viddef.onPaletteChanged);
-	DARRAY_CLEAR (viddef.onVidResize);
 		free (viddef.onPaletteChanged);
+	}
+	if (viddef.onVidResize) {
+		DARRAY_CLEAR (viddef.onVidResize);
 		free (viddef.onVidResize);
 	}
+}
 
 VISIBLE void
 VID_Init (byte *palette, byte *colormap)