nfc: nci: Fix kcov check in nci_rx_work()

Commit 7e8cdc9 ("nfc: Add KCOV annotations") added
kcov_remote_start_common()/kcov_remote_stop() pair into nci_rx_work(),
with an assumption that kcov_remote_stop() is called upon continue of
the for loop. But commit d24b035 ("nfc: nci: Fix uninit-value in
nci_dev_up and nci_ntf_packet") forgot to call kcov_remote_stop() before
break of the for loop.

Reported-by: syzbot <[email protected]>
Closes: https://syzkaller.appspot.com/bug?extid=0438378d6f157baae1a2
Fixes: d24b035 ("nfc: nci: Fix uninit-value in nci_dev_up and nci_ntf_packet")
Suggested-by: Andrey Konovalov <[email protected]>
Signed-off-by: Tetsuo Handa <[email protected]>
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: Tetsuo Handa

net/nfc/nci/core.c

@@ -1518,6 +1518,7 @@ static void nci_rx_work(struct work_struct *work)
 
 		if (!nci_plen(skb->data)) {
 			kfree_skb(skb);
+			kcov_remote_stop();
 			break;
 		}