Update map.c

GAME/src/map.c

@@ -46,7 +46,7 @@ int **maptomatrix(MAP *map){
 	printf("Open : %s \n",map->path);
 	if(!(bin=fopen(map->path,"rb"))){
 		puts("Error to open the map !");
-		return 0;
+		return NULL;
 	}