udf: fix default mode and dmode options handling
On x86 (and several other archs) mode_t is defined as "unsigned short" and comparing unsigned shorts to negative ints is broken (because short is promoted to int and then compared). Fix it. Reported-and-tested-by: NLaurent Riffard <laurent.riffard@free.fr> Signed-off-by: NMarcin Slusarz <marcin.slusarz@gmail.com> Signed-off-by: NJan Kara <jack@suse.cz>
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