If pwm is requested by legacy pwm_request() and if the following
backlight_device_register() call fails, add pwm_free() clean-up.

Signed-off-by: Vladimir Zapolskiy <redacted>
---
 drivers/video/backlight/pwm_bl.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c
index 9991cdb..a691247 100644
--- a/drivers/video/backlight/pwm_bl.c
+++ b/drivers/video/backlight/pwm_bl.c

@@ -307,6 +307,8 @@ static int pwm_backlight_probe(struct platform_device *pdev)
 	if (IS_ERR(bl)) {
 		dev_err(&pdev->dev, "failed to register backlight\n");
 		ret = PTR_ERR(bl);
+		if (pb->legacy)
+			pwm_free(pb->pwm);
 		goto err_alloc;
 	}