wlcore: fix runtime pm imbalance in wl1271_op_suspend

When wlcore_hw_interrupt_notify() returns an error code,
a pairing runtime PM usage counter decrement is needed to
keep the counter balanced.

Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200520125724.12832-1-dinghao.liu@zju.edu.cn

drivers/net/wireless/ti/wlcore/main.c

@@ -1746,9 +1746,7 @@ static int __maybe_unused wl1271_op_suspend(struct ieee80211_hw *hw,
 
 		ret = wl1271_configure_suspend(wl, wlvif, wow);
 		if (ret < 0) {
-			mutex_unlock(&wl->mutex);
-			wl1271_warning("couldn't prepare device to suspend");
-			return ret;
+			goto out_sleep;
 		}
 	}