Math: remove unused variables from tests.

Thanks, Clang 6.

src/Magnum/Math/Test/BezierTest.cpp

@@ -221,7 +221,6 @@ void BezierTest::valueQuadratic() {
 }
 
 void BezierTest::valueCubic() {
-    Vector2 p0(0.0f, 0.0f), p1(10.0f, 15.0f), p2(20.0f, 4.0f), p3(5.0f, -20.0f);
     CubicBezier2D bezier{Vector2{0.0f, 0.0f}, Vector2{10.0f, 15.0f}, Vector2{20.0f, 4.0f}, Vector2{5.0f, -20.0f}};
 
     CORRADE_COMPARE(bezier.value(0.2f), (Vector2{5.8f, 5.984f}));

src/Magnum/Math/Test/UnitTest.cpp

@@ -172,17 +172,16 @@ void UnitTest::addSubtract() {
 void UnitTest::multiplyDivide() {
     constexpr Sec a(3.0f);
     constexpr Sec b(-4.5f);
-    constexpr Sec c(5.0f);
 
-    constexpr Sec d = a*-1.5f;
-    constexpr Sec e = -1.5f*a;
-    constexpr Sec f = b/-1.5f;
+    constexpr Sec c = a*-1.5f;
+    constexpr Sec d = -1.5f*a;
+    constexpr Sec e = b/-1.5f;
+    CORRADE_COMPARE(c, b);
     CORRADE_COMPARE(d, b);
-    CORRADE_COMPARE(e, b);
-    CORRADE_COMPARE(f, a);
+    CORRADE_COMPARE(e, a);
 
-    constexpr Float g = b/a;
-    CORRADE_COMPARE(g, -1.5f);
+    constexpr Float f = b/a;
+    CORRADE_COMPARE(f, -1.5f);
 }
 
 }}}