unreachable code

/src/libraries/mne/c/mne_surface_or_volume.cpp line 3729
Code:
int MneSurfaceOrVolume::check_quad(float **rr)

{
    float diff[3];
    float size;
    int k;

    return OK;

    for (k = 0; k < 4; k++) { // <-- unreachable
