Minor bugfix. Changed call to osipi_fit instead of ivim_fit

Author: IvanARashid

tests/IVIMmodels/unit_tests/test_ivim_fit.py

@@ -97,6 +97,6 @@ def test_ivim_fit_saved(name, bvals, data, algorithm):
         #[f_fit, Dp_fit, D_fit] = fit.ivim_fit(signal, bvals)
         #npt.assert_allclose([data['f'], data['D']], [f_fit, D_fit], atol=tolerance)
         #npt.assert_allclose(data['Dp'], Dp_fit, atol=1e-1)  # go easy on the perfusion as it's a linear fake
-    [f_fit, Dp_fit, D_fit] = fit.ivim_fit(signal, bvals)
+    [f_fit, Dp_fit, D_fit] = fit.osipi_fit(signal, bvals)
     npt.assert_allclose([data['f'], data['D']], [f_fit, D_fit], atol=tolerance)
     npt.assert_allclose(data['Dp'], Dp_fit, atol=1e-1)  # go easy on the perfusion as it's a linear fake