erofs: allow 16-byte volume name again

Actually, volume name doesn't need to include the NIL terminator if
the string length matches the on-disk field size as mentioned in [1].

I tend to relax it together with the upcoming 48-bit block addressing
(or stable kernels which backport this fix) so that we could have a
chance to record a 16-byte volume name like ext4.

Since in-memory `volume_name` has no user, just get rid of the unneeded
check for now.  `sbi->uuid` is useless and avoid it too.

[1] https://lore.kernel.org/r/96efe46b-dcce-4490-bba1-a0b00932d1cc@linux.alibaba.com



Fixes: a64d9493 ("staging: erofs: refuse to mount images with malformed volume name")
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20250225033934.2542635-1-hsiangkao@linux.alibaba.com