mmc: core: Remove unnecessary validations for bus_ops callbacks

Due to the removal of the Kconfig option MMC_UNSAFE_RESUME, several
validations of a present bus_ops callback became redundant. Let's
remove these.

Signed-off-by: Ulf Hansson <[e-mail]>
Signed-off-by: Chris Ball <[e-mail]>

drivers/mmc/core/bus.c

···
 {
 	struct mmc_card *card = mmc_dev_to_card(dev);
 	struct mmc_host *host = card->host;
-	int ret = 0;
 
-	if (host->bus_ops->runtime_suspend)
-		ret = host->bus_ops->runtime_suspend(host);
-
-	return ret;
+	return host->bus_ops->runtime_suspend(host);
 }
 
 static int mmc_runtime_resume(struct device *dev)
 {
 	struct mmc_card *card = mmc_dev_to_card(dev);
 	struct mmc_host *host = card->host;
-	int ret = 0;
 
-	if (host->bus_ops->runtime_resume)
-		ret = host->bus_ops->runtime_resume(host);
-
-	return ret;
+	return host->bus_ops->runtime_resume(host);
 }
 
 static int mmc_runtime_idle(struct device *dev)

drivers/mmc/core/core.c

···
 {
 	struct mmc_card *card = host->card;
 
-	if (!host->bus_ops->power_restore)
-		return -EOPNOTSUPP;
-
 	if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset)
 		return -EOPNOTSUPP;
 
···
 {
 	int ret;
 
-	if ((host->caps & MMC_CAP_NONREMOVABLE) || !host->bus_ops->alive)
+	if (host->caps & MMC_CAP_NONREMOVABLE)
 		return 0;
 
 	if (!host->card || mmc_card_removed(host->card))
···
 	 * if there is a _removable_ card registered, check whether it is
 	 * still present
 	 */
-	if (host->bus_ops && host->bus_ops->detect && !host->bus_dead
+	if (host->bus_ops && !host->bus_dead
 	    && !(host->caps & MMC_CAP_NONREMOVABLE))
 		host->bus_ops->detect(host);
 
···
 
 	mmc_bus_get(host);
 
-	if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) {
+	if (!host->bus_ops || host->bus_dead) {
 		mmc_bus_put(host);
 		return -EINVAL;
 	}
···
 
 	mmc_bus_get(host);
 
-	if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) {
+	if (!host->bus_ops || host->bus_dead) {
 		mmc_bus_put(host);
 		return -EINVAL;
 	}
···
 		/* Validate prerequisites for suspend */
 		if (host->bus_ops->pre_suspend)
 			err = host->bus_ops->pre_suspend(host);
-		if (!err && host->bus_ops->suspend)
+		if (!err)
 			break;
 
 		/* Calling bus_ops->remove() with a claimed host can deadlock */