brcm80211: fix possible memleak in brcmf_proto_msgbuf_attach

When brcmf_proto_msgbuf_attach fail and msgbuf->txflow_wq != NULL,
we should destroy the workqueue.

Reported-by: Hulk Robot <[email protected]>
Signed-off-by: Wang Yufen <[email protected]>
Signed-off-by: Kalle Valo <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: wangyufen316

drivers/net/wireless/broadcom/brcm80211/brcmfmac/msgbuf.c

@@ -1620,6 +1620,8 @@ int brcmf_proto_msgbuf_attach(struct brcmf_pub *drvr)
 					  BRCMF_TX_IOCTL_MAX_MSG_SIZE,
 					  msgbuf->ioctbuf,
 					  msgbuf->ioctbuf_handle);
+		if (msgbuf->txflow_wq)
+			destroy_workqueue(msgbuf->txflow_wq);
 		kfree(msgbuf);
 	}
 	return -ENOMEM;