[patch] Input: wacom - check for allocation failure in probe()

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We accidentally removed the check for NULL in 3aac0ef10b "Input: wacom -
isolate input registration".

Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

diff --git a/drivers/input/tablet/wacom_sys.c b/drivers/input/tablet/wacom_sys.c
index 19ba586..0d26921 100644
--- a/drivers/input/tablet/wacom_sys.c
+++ b/drivers/input/tablet/wacom_sys.c
@@ -1002,6 +1002,8 @@ static int wacom_probe(struct usb_interface *intf, const struct usb_device_id *i
 		return -EINVAL;
 
 	wacom = kzalloc(sizeof(struct wacom), GFP_KERNEL);
+	if (!wacom)
+		return -ENOMEM;
 
 	wacom_wac = &wacom->wacom_wac;
 	wacom_wac->features = *((struct wacom_features *)id->driver_info);
--
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