Function SCIPnodeReleaseLPIState 

pub unsafe extern "C" fn SCIPnodeReleaseLPIState(
    node: *mut SCIP_NODE,
    blkmem: *mut BMS_BLKMEM,
    lp: *mut SCIP_LP,
) -> SCIP_RETCODE

decreases the reference counter of the LP state in the fork or subroot node