USB: usbtest: prevent a divide by zero bug

If param->length is zero, then this could lead to a divide by zero bug
later in the function when we do: size %= max;

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/misc/usbtest.c b/drivers/usb/misc/usbtest.c
index f10bd97..7667b12 100644
--- a/drivers/usb/misc/usbtest.c
+++ b/drivers/usb/misc/usbtest.c
@@ -423,6 +423,9 @@
 	unsigned		i;
 	unsigned		size = max;
 
+	if (max == 0)
+		return NULL;
+
 	sg = kmalloc_array(nents, sizeof *sg, GFP_KERNEL);
 	if (!sg)
 		return NULL;