iio:trigger: Introduce the use of devm_kzalloc

This patch introduces the use of the managed version of kzalloc and
removes the kfrees in the probe and remove functions. More return
paths are added and the labels are renamed to order them.
Signed-off-by: Himangi Saraogi <himangi774@gmail.com>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/staging/iio/trigger/iio-trig-bfin-timer.c

@@ -182,45 +182,40 @@ static int iio_bfin_tmr_trigger_probe(struct platform_device *pdev)
 	unsigned int config;
 	int ret;
 
-	st = kzalloc(sizeof(*st), GFP_KERNEL);
-	if (st == NULL) {
-		ret = -ENOMEM;
-		goto out;
-	}
+	st = devm_kzalloc(&pdev->dev, sizeof(*st), GFP_KERNEL);
+	if (st == NULL)
+		return -ENOMEM;
 
 	st->irq = platform_get_irq(pdev, 0);
 	if (!st->irq) {
 		dev_err(&pdev->dev, "No IRQs specified");
-		ret = -ENODEV;
-		goto out1;
+		return -ENODEV;
 	}
 
 	ret = iio_bfin_tmr_get_number(st->irq);
 	if (ret < 0)
-		goto out1;
+		return ret;
 
 	st->timer_num = ret;
 	st->t = &iio_bfin_timer_code[st->timer_num];
 
 	st->trig = iio_trigger_alloc("bfintmr%d", st->timer_num);
-	if (!st->trig) {
-		ret = -ENOMEM;
-		goto out1;
-	}
+	if (!st->trig)
+		return -ENOMEM;
 
 	st->trig->ops = &iio_bfin_tmr_trigger_ops;
 	st->trig->dev.groups = iio_bfin_tmr_trigger_attr_groups;
 	iio_trigger_set_drvdata(st->trig, st);
 	ret = iio_trigger_register(st->trig);
 	if (ret)
-		goto out2;
+		goto out;
 
 	ret = request_irq(st->irq, iio_bfin_tmr_trigger_isr,
 			  0, st->trig->name, st);
 	if (ret) {
 		dev_err(&pdev->dev,
 			"request IRQ-%d failed", st->irq);
-		goto out4;
+		goto out1;
 	}
 
 	config = PWM_OUT | PERIOD_CNT | IRQ_ENA;
@@ -260,13 +255,10 @@ static int iio_bfin_tmr_trigger_probe(struct platform_device *pdev)
 	return 0;
 out_free_irq:
 	free_irq(st->irq, st);
-out4:
-	iio_trigger_unregister(st->trig);
-out2:
-	iio_trigger_put(st->trig);
 out1:
-	kfree(st);
+	iio_trigger_unregister(st->trig);
 out:
+	iio_trigger_put(st->trig);
 	return ret;
 }
 
@@ -280,7 +272,6 @@ static int iio_bfin_tmr_trigger_remove(struct platform_device *pdev)
 	free_irq(st->irq, st);
 	iio_trigger_unregister(st->trig);
 	iio_trigger_put(st->trig);
-	kfree(st);
 
 	return 0;
 }