clk: Return value calculated by ERR_PTR

clk: Return value calculated by ERR_PTR

In clk_set_default_get_by_id ret is passed to ERR_PTR but nothing is
done with the value that this calculates which is obviously not the
intention of the code. This is confirmed by the code around where this
function is called.
Instead return the value from ERR_PTR.

Then fixup the sandbox code so that the test dm_test_clk does not fail
as it relied on the broken behaviour.

Finally disable part of the test that does not work correctly with
CLK_AUTO_ID

This issue found by Smatch.

Signed-off-by: Andrew Goodbody <andrew.goodbody@linaro.org>