rpmsg: qcom_smd: Fix returning 0 if irq_of_parse_and_map() fails

irq_of_parse_and_map() returns 0 on failure, so this should not be
passed further as error return code.

Fixes: 1a358d3 ("rpmsg: qcom_smd: Fix irq_of_parse_and_map() return value")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220423093932.32136-1-krzysztof.kozlowski@linaro.org

Author: krzk

drivers/rpmsg/qcom_smd.c

@@ -1409,7 +1409,7 @@ static int qcom_smd_parse_edge(struct device *dev,
 	irq = irq_of_parse_and_map(node, 0);
 	if (!irq) {
 		dev_err(dev, "required smd interrupt missing\n");
-		ret = irq;
+		ret = -EINVAL;
 		goto put_node;
 	}