slimbus: qcom-ngd: use correct error in message of pdr_add_lookup() failure

Use correct error code, instead of previous 'ret' value, when printing
error from pdr_add_lookup() failure.

Fixes: e1ae85e1 ("slimbus: qcom-ngd-ctrl: add Protection Domain Restart Support")
Cc: <stable@vger.kernel.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20220916122910.170730-2-srinivas.kandagatla@linaro.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>