ASoC: soc-card: soc-card-test: Fix some error handling in init()

There are two issues here:
1) The get_device() needs a matching put_device() on error paths.
2) The "if (!ret)" was supposed to be "if (ret)".

I re-arranged the code a bit to do the allocation before the
get_device().

Fixes: ef7784e4 ("ASoC: soc-card: Add KUnit test case for snd_soc_card_get_kcontrol")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://lore.kernel.org/r/450dd21a-b24b-48ba-9aa4-c02e4617852f@moroto.mountain


Signed-off-by: Mark Brown <broonie@kernel.org>