refactor: Change name

data/tetests/spsolve_test.txt

@@ -2,4 +2,4 @@ a = sparse([0,0,0,1,2,2], [0,1,2,1,1,2], [1,1,2,3,3,sin(8-2)], 3, 3);
 b = [1,12,7];
 b = [1,12,7];
 r = sp_linsolve(a, b, [0,0,0]);
 r = sp_linsolve(a, b, [0,0,0]);
 r2 = sp_linsolve(a, b);
 r2 = sp_linsolve(a, b);
-return r - r2;
+return r;
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