[PATCH] mailbox: mailbox-test: Fix a potential Oops on allocation failure

[Dan Carpenter]

The callers are expecting NULL on error so if we return an error pointer
it eventually results in an Oops.

Fixes: 8ea4484d0c2b ("mailbox: Add generic mechanism for testing Mailbox 
Controllers")
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>
---
 drivers/mailbox/mailbox-test.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mailbox/mailbox-test.c b/drivers/mailbox/mailbox-test.c
index 4555d678fadda..51640a7999e6b 100644
--- a/drivers/mailbox/mailbox-test.c
+++ b/drivers/mailbox/mailbox-test.c
@@ -327,7 +327,7 @@ mbox_test_request_channel(struct platform_device *pdev, 
const char *name)
 
        client = devm_kzalloc(&pdev->dev, sizeof(*client), GFP_KERNEL);
        if (!client)
-               return ERR_PTR(-ENOMEM);
+               return NULL;
 
        client->dev             = &pdev->dev;
        client->rx_callback     = mbox_test_receive_message;
-- 
2.26.2