Two new bugs found by fuzzing

["Xu, Wen" <wen.xu@xxxxxxxxxx>]

Hi,

Please check details at
use-after-free in ext4_put_super(): https://bugzilla.kernel.org/show_bug.cgi?id=200931
Divide zero in __ext4_check_dir_entry: https://bugzilla.kernel.org/show_bug.cgi?id=200933

Thanks,
Wen