mmc: sdio: fix runtime PM path during driver removal

After commit e1866b33 "PM / Runtime: Rework runtime PM handling
during driver removal" was introduced, the driver core stopped
incrementing the runtime PM usage counter of the device during
the invocation of the ->remove() callback.

This indirectly broke SDIO's runtime PM path during driver removal,
because no one calls _put_sync() anymore after ->remove() completes.

This means that the power of runtime-PM-managed SDIO cards is kept
high after their driver is removed (even if it was powered down
beforehand).

Fix that by directly calling _put_sync() when the last usage
counter is downref'ed by the SDIO bus.
Reported-and-tested-by: Daniel Drake <dsd@laptop.org>
Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

drivers/mmc/core/sdio_bus.c

@@ -189,7 +189,7 @@ static int sdio_bus_remove(struct device *dev)
 
 	/* Then undo the runtime PM settings in sdio_bus_probe() */
 	if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
-		pm_runtime_put_noidle(dev);
+		pm_runtime_put_sync(dev);
 
 out:
 	return ret;