[PATCH] mfd: sm501: Add NULL check on devm_kzalloc return value

["Gustavo A. R. Silva" <garsilva@embeddedor.com>]

Check return value from call to devm_kzalloc() in order to prevent
a NULL pointer dereference.

This issue was detected with the help of Coccinelle.

Fixes: b2e63555592f ("i2c: gpio: Convert to use descriptors")
Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
---
 drivers/mfd/sm501.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/mfd/sm501.c b/drivers/mfd/sm501.c
index ad77416..08bee41 100644
--- a/drivers/mfd/sm501.c
+++ b/drivers/mfd/sm501.c
@@ -1144,6 +1144,9 @@ static int sm501_register_gpio_i2c_instance(struct sm501_devdata *sm,
 	lookup = devm_kzalloc(&pdev->dev,
 			      sizeof(*lookup) + 3 * sizeof(struct gpiod_lookup),
 			      GFP_KERNEL);
+	if (!lookup)
+		return -ENOMEM;
+
 	lookup->dev_id = "i2c-gpio";
 	if (iic->pin_sda < 32)
 		lookup->table[0].chip_label = "SM501-LOW";
-- 
2.7.4