d3dx9: Fix D3DXMatrixStack_RotateAxisLocal to make tests pass in Windows.

dlls/d3dx9_36/math.c

@@ -946,7 +946,6 @@ static HRESULT WINAPI ID3DXMatrixStackImpl_RotateAxisLocal(ID3DXMatrixStack *ifa
 
     TRACE("iface %p\n", iface);
 
-    if (!pv) return D3DERR_INVALIDCALL;
     D3DXMatrixRotationAxis(&temp, pv, angle);
     D3DXMatrixMultiply(&This->stack[This->current], &temp, &This->stack[This->current]);
 

dlls/d3dx9_36/tests/math.c

@@ -1519,9 +1519,6 @@ static void test_matrix_stack(void)
     ok(SUCCEEDED(hr), "Pop failed, hr %#x\n", hr);
     ok(D3DXMatrixIsIdentity(ID3DXMatrixStack_GetTop(stack)), "The top should be an identity matrix\n");
 
-    hr = ID3DXMatrixStack_RotateAxisLocal(stack, NULL, 2.0f);
-    ok(hr == D3DERR_INVALIDCALL, "Expected D3DERR_INVALIDCALL, got %#x\n", hr);
-
     refcount = ID3DXMatrixStack_Release(stack);
     ok(!refcount, "Matrix stack has %u references left.\n", refcount);
 }