If every texture would vanish in
SL that is not licensed by the original creator or build from scratch by its user / merchant, we would be living in a mainly plywood world (If even that texture is an original LL produced one).
My advise: Don't try to be holier than the Pope in this case.
If the copyright holder ever will adress you about this, then it is time to say sorry and take the texture down.
As long as it is for private use, no big things like law suits and fines will ever happen IMHO.