pwm: sysfs: Replace sprintf() with sysfs_emit()

While the uses in this code are unproblematic, it's generally safer for
sysfs outputs to use the new sysfs_emit() helper instead of raw calls to
sprintf() and friends. This also has the benefit of annotating the uses,
which makes them easier to audit and potentially use them to generate
sysfs documentation from them.

This patch replaces existing sprintf() calls straightforwardly with the
new helper.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

drivers/pwm/sysfs.c

@@ -42,7 +42,7 @@ static ssize_t period_show(struct device *child,
 
 	pwm_get_state(pwm, &state);
 
-	return sprintf(buf, "%llu\n", state.period);
+	return sysfs_emit(buf, "%llu\n", state.period);
 }
 
 static ssize_t period_store(struct device *child,
@@ -77,7 +77,7 @@ static ssize_t duty_cycle_show(struct device *child,
 
 	pwm_get_state(pwm, &state);
 
-	return sprintf(buf, "%llu\n", state.duty_cycle);
+	return sysfs_emit(buf, "%llu\n", state.duty_cycle);
 }
 
 static ssize_t duty_cycle_store(struct device *child,
@@ -112,7 +112,7 @@ static ssize_t enable_show(struct device *child,
 
 	pwm_get_state(pwm, &state);
 
-	return sprintf(buf, "%d\n", state.enabled);
+	return sysfs_emit(buf, "%d\n", state.enabled);
 }
 
 static ssize_t enable_store(struct device *child,
@@ -171,7 +171,7 @@ static ssize_t polarity_show(struct device *child,
 		break;
 	}
 
-	return sprintf(buf, "%s\n", polarity);
+	return sysfs_emit(buf, "%s\n", polarity);
 }
 
 static ssize_t polarity_store(struct device *child,
@@ -212,7 +212,7 @@ static ssize_t capture_show(struct device *child,
 	if (ret)
 		return ret;
 
-	return sprintf(buf, "%u %u\n", result.period, result.duty_cycle);
+	return sysfs_emit(buf, "%u %u\n", result.period, result.duty_cycle);
 }
 
 static DEVICE_ATTR_RW(period);
@@ -361,7 +361,7 @@ static ssize_t npwm_show(struct device *parent, struct device_attribute *attr,
 {
 	const struct pwm_chip *chip = dev_get_drvdata(parent);
 
-	return sprintf(buf, "%u\n", chip->npwm);
+	return sysfs_emit(buf, "%u\n", chip->npwm);
 }
 static DEVICE_ATTR_RO(npwm);