character: don't call character callback indefinitely after animation finishes

This could happen when the repeats counter went down to 0 with
no successor - the callback would then be called every frame.

src/character.c

@@ -54,6 +54,7 @@ SYMBOL_EXPORT void SelectSpritesheet(struct Game* game, struct Character* charac
 			character->reversing = tmp->reversed ^ reversed;
 			character->frame = &tmp->frames[character->pos];
 			//character->bitmap = tmp->frames[character->pos].bitmap;
+			character->finished = false;
 			PrintConsole(game, "SUCCESS: Spritesheet for %s activated: %s (%dx%d)", character->name, character->spritesheet->name, character->spritesheet->width, character->spritesheet->height);
 			return;
 		}
@@ -473,6 +474,10 @@ SYMBOL_EXPORT void AnimateCharacter(struct Game* game, struct Character* charact
 		return;
 	}
 
+	if (character->finished) {
+		return;
+	}
+
 	delta *= speed_modifier;
 	character->delta += delta * 1000;
 
@@ -535,6 +540,7 @@ SYMBOL_EXPORT void AnimateCharacter(struct Game* game, struct Character* charact
 						} else {
 							character->pos = character->spritesheet->frame_count - 1;
 						}
+						character->finished = true;
 						if (character->callback) {
 							character->callback(game, character, NULL, character->spritesheet, character->callback_data);
 						}

src/character.h

@@ -107,6 +107,7 @@ struct Character {
 	bool reversing; /*!< Whether the animation is currently played backwards. */
 	bool reversed; /*!< Whether the current animation has been requested as reversed. */
 	bool hidden;
+	bool finished;
 	void* data; /*!< Additional, custom character data (HP etc.). */
 	CharacterCallback* callback;
 	void* callback_data;