Fix: rcond_hilbert test

Author: gkobeaga

ndarray-linalg/tests/solve.rs

@@ -254,7 +254,7 @@ fn rcond_hilbert() {
     macro_rules! rcond_hilbert {
         ($elem:ty, $rows:expr, $atol:expr) => {
             let a = Array2::<$elem>::from_shape_fn(($rows, $rows), |(i, j)| {
-                1. / (i as $elem + j as $elem - 1.)
+                1. / (i as $elem + j as $elem + 1.)
             });
             assert_aclose!(a.rcond().unwrap(), 0., $atol);
             assert_aclose!(a.rcond_into().unwrap(), 0., $atol);