volume_id: volume_id_get_buffer with small FSes

I was working with some very small ext4 filesystems, used for
overlaying on immutable VM/container images.  If it's only desired to
overlay a single config file, these filesystems can be very small
indeed, and so ran afoul of this length check.

Since 4fc5ec56f ("device matching against UUIDs: do not try
floppies") (from 2009), floppy drives are skipped before this function
is even called.  Reading from an unused loop device returns 0, so it
should be fine to reduce  the minimum length.

Signed-off-by: Alyssa Ross via busybox <busybox@busybox.net>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

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