Coning term is always zero

[WillRam]

In the code:

// Save current measurements
    Vector3f  prevDelAng = correctedDelAng;

// Apply corrections for earths rotation rate and coning errors
// * and + operators have been overloaded
    correctedDelAng   = correctedDelAng - Tnb*earthRateNED*dtIMU + 8.333333333333333e-2f*(prevDelAng % correctedDelAng);

the cross product prevDelAng % correctedDelAng will always be zero as they have the same value