libblkid & empty identifier values

["Pali Rohár" <pali.rohar@gmail.com>]

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Hello!

Technically UDF filesystem allows to store empty string values. 
LogicalVolumeIdentifier (label) according to UDF specification shall not 
be null, but it is possible to store empty string there.

Question is, what should libblkid's udf code do if e.g. LABEL identifier 
is empty string? Should it set empty LABEL for libblkid? Or it should 
not set LABEL at all?

Currently in blkid_probe_set_label() is check for len > 1, so empty 
string is not possible to store for LABEL. But when check fails function 
return non-negative value which is understood as succeeded -- even it 
did not store empty string. It does not looks good... Or it is expected?

-- 
Pali Rohár
pali.rohar@gmail.com

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