Input: soc_button_array - add missing memory allocation check

Signed-off-by: Pramod Gurav <[e-mail]>
Signed-off-by: Dmitry Torokhov <[e-mail]>

drivers/input/misc/soc_button_array.c

···
 				       sizeof(*gpio_keys_pdata) +
 					sizeof(*gpio_keys) * MAX_NBUTTONS,
 				       GFP_KERNEL);
+	if (!gpio_keys_pdata)
+		return ERR_PTR(-ENOMEM);
+
 	gpio_keys = (void *)(gpio_keys_pdata + 1);
 
 	for (info = button_info; info->name; info++) {