[PATCH] mailbox: mediatek: Add check for possible failure of kzalloc

[Houlong Wei]

The patch 623a6143a845("mailbox: mediatek: Add Mediatek CMDQ driver")
introduce the following static checker warning:
  drivers/mailbox/mtk-cmdq-mailbox.c:366 cmdq_mbox_send_data()
  error: potential null dereference 'task'.  (kzalloc returns null)

Fixes: 623a6143a845 ("mailbox: mediatek: Add Mediatek CMDQ driver")
Reported-by: Dan Carpenter <dan.carpen...@oracle.com>
Signed-off-by: Houlong Wei <houlong....@mediatek.com>
---
 drivers/mailbox/mtk-cmdq-mailbox.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/mailbox/mtk-cmdq-mailbox.c 
b/drivers/mailbox/mtk-cmdq-mailbox.c
index aec46d5..f7cc29c 100644
--- a/drivers/mailbox/mtk-cmdq-mailbox.c
+++ b/drivers/mailbox/mtk-cmdq-mailbox.c
@@ -363,6 +363,9 @@ static int cmdq_mbox_send_data(struct mbox_chan *chan, void 
*data)
        WARN_ON(cmdq->suspended);
 
        task = kzalloc(sizeof(*task), GFP_ATOMIC);
+       if (!task)
+               return -ENOMEM;
+
        task->cmdq = cmdq;
        INIT_LIST_HEAD(&task->list_entry);
        task->pa_base = pkt->pa_base;
-- 
1.7.9.5