firmware: qcom: scm: Fix error code in probe()

Set the error code if devm_qcom_tzmem_pool_new() fails.  Don't return
success.

Fixes: 1e76b546 ("firmware: qcom: scm: Cleanup global '__scm' on probe failures")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/a0845467-4f83-4070-ab1e-ff7e6764609f@stanley.mountain


Signed-off-by: Bjorn Andersson <andersson@kernel.org>