The return value of mtk_vcp_mbox_xlate() is checked by IS_ERR(), so
return NULL is incorrect and could lead to a NULL pointer dereference.

Fixes: b562abd95672 ("mailbox: mediatek: Add mtk-vcp-mailbox driver")
Signed-off-by: Felix Gu <redacted>
---
 drivers/mailbox/mtk-vcp-mailbox.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mailbox/mtk-vcp-mailbox.c b/drivers/mailbox/mtk-vcp-mailbox.c
index cedad575528f..1b291b8ea15a 100644
--- a/drivers/mailbox/mtk-vcp-mailbox.c
+++ b/drivers/mailbox/mtk-vcp-mailbox.c

@@ -50,7 +50,7 @@ static struct mbox_chan *mtk_vcp_mbox_xlate(struct mbox_controller *mbox,
                                            const struct of_phandle_args *sp)
 {
        if (sp->args_count)
-               return NULL;
+               return ERR_PTR(-EINVAL);

        return &mbox->chans[0];
 }