restrict loop to input_color_count

Co-authored-by: Scott Shawcroft <[email protected]>

Author: FoamyGuy

shared-module/tilepalettemapper/TilePaletteMapper.c

@@ -49,7 +49,7 @@ mp_obj_t common_hal_tilepalettemapper_tilepalettemapper_get_mapping(tilepalettem
 
 void common_hal_tilepalettemapper_tilepalettemapper_set_mapping(tilepalettemapper_tilepalettemapper_t *self, uint16_t x, uint16_t y, size_t len, mp_obj_t *items) {
     uint32_t palette_len = common_hal_displayio_palette_get_len(self->palette);
-    for (uint16_t i = 0; i < len; i++) {
+    for (uint16_t i = 0; i < MIN(len, self->input_color_count); i++) {
         int mapping_val = mp_arg_validate_type_int(items[i], MP_QSTR_mapping_value);
         mp_arg_validate_int_range(mapping_val, 0, palette_len - 1, MP_QSTR_mapping_value);
         self->tile_mappings[y * self->width_in_tiles + x][i] = mapping_val;