oceani: don't store 'tail' in 'struct value'.

oceani: don't store 'tail' in 'struct value'.

It is never used so there isn't much point
storing it.  If/When we do use it, we'll
parse it immediately and store the meaning.
And in any case, it should be char[3].

Signed-off-by: NeilBrown <neil@brown.name>