ath11k: Add checked value for ath11k_ahb_remove

Return value form wait_for_completion_timeout should to be checked.

This is detected by Coverity: #CID:1464479 (CHECKED_RETURN)

Fixes: d5c6515 ("ath11k: driver for Qualcomm IEEE 802.11ax devices")
Signed-off-by: Bo YU <tsu.yubo@gmail.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200621095136.7xdbzkthoxuw2qow@debian.debian-2

drivers/net/wireless/ath/ath11k/ahb.c

@@ -718,12 +718,16 @@ static int ath11k_ahb_probe(struct platform_device *pdev)
 static int ath11k_ahb_remove(struct platform_device *pdev)
 {
 	struct ath11k_base *ab = platform_get_drvdata(pdev);
+	unsigned long left;
 
 	reinit_completion(&ab->driver_recovery);
 
-	if (test_bit(ATH11K_FLAG_RECOVERY, &ab->dev_flags))
-		wait_for_completion_timeout(&ab->driver_recovery,
-					    ATH11K_AHB_RECOVERY_TIMEOUT);
+	if (test_bit(ATH11K_FLAG_RECOVERY, &ab->dev_flags)) {
+		left = wait_for_completion_timeout(&ab->driver_recovery,
+						   ATH11K_AHB_RECOVERY_TIMEOUT);
+		if (!left)
+			ath11k_warn(ab, "failed to receive recovery response completion\n");
+	}
 
 	set_bit(ATH11K_FLAG_UNREGISTERING, &ab->dev_flags);
 	cancel_work_sync(&ab->restart_work);