drivers/video/backlight/lm3630a_bl.c: add missing destroy_workqueue() on error in lm3630a_intr_config()

Add the missing destroy_workqueue() before return from
lm3630a_intr_config() in the error handling case.

Signed-off-by: Wei Yongjun <[e-mail]>
Acked-by: Jingoo Han <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/video/backlight/lm3630a_bl.c

···
 	    (pchip->irq, NULL, lm3630a_isr_func,
 	     IRQF_TRIGGER_FALLING | IRQF_ONESHOT, "lm3630a_irq", pchip)) {
 		dev_err(pchip->dev, "request threaded irq fail\n");
+		destroy_workqueue(pchip->irqthread);
 		return -ENOMEM;
 	}
 	return rval;