HID: core: use scnprintf in modalias_show()

scnprintf() exists to provide these semantics, so we might as well use
it.
Signed-off-by: NRasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

drivers/hid/hid-core.c

@@ -2217,12 +2217,9 @@ static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
 			     char *buf)
 {
 	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
-	int len;
-
-	len = snprintf(buf, PAGE_SIZE, "hid:b%04Xg%04Xv%08Xp%08X\n",
-		       hdev->bus, hdev->group, hdev->vendor, hdev->product);
 
-	return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
+	return scnprintf(buf, PAGE_SIZE, "hid:b%04Xg%04Xv%08Xp%08X\n",
+			 hdev->bus, hdev->group, hdev->vendor, hdev->product);
 }
 static DEVICE_ATTR_RO(modalias);