Fix regression in least_squares_fit.cpp
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@ -69,10 +69,9 @@ int finish_incremental_LSF(struct linear_fit_data *lsf) {
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lsf->x2bar = lsf->x2bar / N - sq(lsf->xbar);
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lsf->y2bar = lsf->y2bar / N - sq(lsf->ybar);
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lsf->z2bar = lsf->z2bar / N - sq(lsf->zbar);
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lsf->xybar = lsf->xybar / N - sq(lsf->xbar);
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lsf->yzbar = lsf->yzbar / N - sq(lsf->ybar);
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lsf->xzbar = lsf->xzbar / N - sq(lsf->xbar);
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lsf->xybar = lsf->xybar / N - lsf->xbar * lsf->ybar;
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lsf->yzbar = lsf->yzbar / N - lsf->ybar * lsf->zbar;
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lsf->xzbar = lsf->xzbar / N - lsf->xbar * lsf->zbar;
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const float DD = lsf->x2bar * lsf->y2bar - sq(lsf->xybar);
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if (fabs(DD) <= 1e-10 * (lsf->max_absx + lsf->max_absy))
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return -1;
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