[os2] Fix use of uninitialized value
[os2] Fix use of uninitialized value

Thanks to Kunihiko Sakamoto.

A typo introduced in 0768b814162812c40f661eb57cb58b3a1835209d.

irori/ots,irori/ots,davelab6/ots,davelab6/ots,anthrotype/ots,anthrotype/ots,khaledhosny/ots