usb: gadget: udc: Use scnprintf() instead of snprintf()

The show() method should use scnprintf() not snprintf() because snprintf()
may returns a value that exceeds its second argument.

Signed-off-by: Jaejoong Kim <climbbb.kim@gmail.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

drivers/usb/gadget/udc/core.c

@@ -1482,7 +1482,7 @@ ssize_t name##_show(struct device *dev,					\
 		struct device_attribute *attr, char *buf)		\
 {									\
 	struct usb_udc *udc = container_of(dev, struct usb_udc, dev);	\
-	return snprintf(buf, PAGE_SIZE, "%s\n",				\
+	return scnprintf(buf, PAGE_SIZE, "%s\n",			\
 			usb_speed_string(udc->gadget->param));		\
 }									\
 static DEVICE_ATTR_RO(name)
@@ -1497,7 +1497,7 @@ ssize_t name##_show(struct device *dev,				\
 	struct usb_udc		*udc = container_of(dev, struct usb_udc, dev); \
 	struct usb_gadget	*gadget = udc->gadget;		\
 								\
-	return snprintf(buf, PAGE_SIZE, "%d\n", gadget->name);	\
+	return scnprintf(buf, PAGE_SIZE, "%d\n", gadget->name);	\
 }								\
 static DEVICE_ATTR_RO(name)
 

drivers/usb/gadget/udc/dummy_hcd.c

@@ -2366,7 +2366,7 @@ static inline ssize_t show_urb(char *buf, size_t size, struct urb *urb)
 {
 	int ep = usb_pipeendpoint(urb->pipe);
 
-	return snprintf(buf, size,
+	return scnprintf(buf, size,
 		"urb/%p %s ep%d%s%s len %d/%d\n",
 		urb,
 		({ char *s;