Changes the lvgl filesystem `tell()` wrapper to check for errors returned
by zephyr filesystem subsystem.
Signed-off-by: Fabian Blatz <fabianblatz@gmail.com>
Changes the memory management for the lvgl filesystem wrapper to use the
memory management strategy selected by kconfig. Additionally fixes memory
leaks if fs_{file,dir}_t initialization failed.
Signed-off-by: Fabian Blatz <fabianblatz@gmail.com>