[PATCH] maiblox: mediatek: Fix handling of platform_get_irq() error

[Krzysztof Kozlowski]

platform_get_irq() returns -ERRNO on error.  In such case comparison
to 0 would pass the check.

Fixes: 623a6143a845 ("mailbox: mediatek: Add Mediatek CMDQ driver")
Signed-off-by: Krzysztof Kozlowski <k...@kernel.org>
---
 drivers/mailbox/mtk-cmdq-mailbox.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/mailbox/mtk-cmdq-mailbox.c 
b/drivers/mailbox/mtk-cmdq-mailbox.c
index 484d4438cd83..76e4dfcf5228 100644
--- a/drivers/mailbox/mtk-cmdq-mailbox.c
+++ b/drivers/mailbox/mtk-cmdq-mailbox.c
@@ -525,10 +525,8 @@ static int cmdq_probe(struct platform_device *pdev)
        }
 
        cmdq->irq = platform_get_irq(pdev, 0);
-       if (!cmdq->irq) {
-               dev_err(dev, "failed to get irq\n");
-               return -EINVAL;
-       }
+       if (!cmdq->irq < 0)
+               return cmdq->irq;
 
        plat_data = (struct gce_plat *)of_device_get_match_data(dev);
        if (!plat_data) {
-- 
2.17.1