USB: serial: mos7720: Fix possible null pointer dereference

Signed-off-by: Huzaifa Sidhpurwala <huzaifas@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/serial/mos7720.c b/drivers/usb/serial/mos7720.c
index 7d3bc9a..ae506f4 100644
--- a/drivers/usb/serial/mos7720.c
+++ b/drivers/usb/serial/mos7720.c
@@ -2052,7 +2052,7 @@
 	struct usb_device *dev;
 	int i;
 	char data;
-	u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
+	u16 product;
 	int ret_val;
 
 	dbg("%s: Entering ..........", __func__);
@@ -2062,6 +2062,7 @@
 		return -ENODEV;
 	}
 
+	product = le16_to_cpu(serial->dev->descriptor.idProduct);
 	dev = serial->dev;
 
 	/*