gpio/omap: fix possible memory leak in omap2_gpio_dev_init()

pdata and pdata->regs have been allocated in this function and
should be freed before leaving it, and in the other error handling
cases too.

spatch with a semantic match is used to found this problem.
(http://coccinelle.lip6.fr/)
Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Acked-by: Kevin Hilman <khilman@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/gpio.c

@@ -60,6 +60,7 @@ static int __init omap2_gpio_dev_init(struct omap_hwmod *oh, void *unused)
 	pdata->regs = kzalloc(sizeof(struct omap_gpio_reg_offs), GFP_KERNEL);
 	if (!pdata->regs) {
 		pr_err("gpio%d: Memory allocation failed\n", id);
+		kfree(pdata);
 		return -ENOMEM;
 	}
 
@@ -121,6 +122,7 @@ static int __init omap2_gpio_dev_init(struct omap_hwmod *oh, void *unused)
 		break;
 	default:
 		WARN(1, "Invalid gpio bank_type\n");
+		kfree(pdata->regs);
 		kfree(pdata);
 		return -EINVAL;
 	}