counter: ti-ecap-capture: Use devm_pm_runtime_enable()

There is no need to register a manual `devm` action for
`pm_runtime_disable()` when `devm_pm_runtime_enable()` exists. It does
the same thing (but also calls `pm_runtime_dont_use_autosuspend()`,
which should be fine here).

Moreover, when `devm_add_action_or_reset()` fails, it is due to a failed
memory allocation and will thus return `-ENOMEM`. `dev_err_probe()`
doesn't do anything when error is `-ENOMEM`. Therefore, the call to
`dev_err_probe()` is useless. Note that `devm_pm_runtime_enable()` has a
tail call to `devm_add_action_or_reset()` and thus returns that value.
Therefore, replace `dev_err_probe()` with the returning value.

Signed-off-by: Waqar Hameed <[e-mail]>
Acked-by: Andrew Davis <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: William Breathitt Gray <[e-mail]>

drivers/counter/ti-ecap-capture.c

···
 	return IRQ_HANDLED;
 }
 
-static void ecap_cnt_pm_disable(void *dev)
-{
-	pm_runtime_disable(dev);
-}
-
 static int ecap_cnt_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
···
 
 	platform_set_drvdata(pdev, counter_dev);
 
-	pm_runtime_enable(dev);
-
-	/* Register a cleanup callback to care for disabling PM */
-	ret = devm_add_action_or_reset(dev, ecap_cnt_pm_disable, dev);
+	ret = devm_pm_runtime_enable(dev);
 	if (ret)
-		return dev_err_probe(dev, ret, "failed to add pm disable action\n");
+		return ret;
 
 	ret = devm_counter_add(dev, counter_dev);
 	if (ret)