Bluetooth: hci_bcm: Fix unbalanced pm_runtime_disable()

On ->setup, pm_runtime_enable() is only called if a valid IRQ was found,
but on ->close(), pm_runtime_disable() is called unconditionally.
Disablement of runtime PM is recorded in a counter, so every
pm_runtime_disable() needs to be balanced.  Fix it.

Cc: Frédéric Danis <frederic.danis.oss@gmail.com>
Reported-and-reviewed-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NLukas Wunner <lukas@wunner.de>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

drivers/bluetooth/hci_bcm.c

@@ -375,10 +375,10 @@ static int bcm_close(struct hci_uart *hu)
 		if (IS_ENABLED(CONFIG_PM) && bdev->irq > 0) {
 			devm_free_irq(bdev->dev, bdev->irq, bdev);
 			device_init_wakeup(bdev->dev, false);
+			pm_runtime_disable(bdev->dev);
 		}
 
 		bcm_gpio_set_power(bdev, false);
-		pm_runtime_disable(bdev->dev);
 		pm_runtime_set_suspended(bdev->dev);
 	}
 	mutex_unlock(&bcm_device_lock);