staging/ft1000: Return -ENOMEM if kmalloc fails at ft1000_probe

If the kmalloc fails return -ENOMEM , returning 0 is not the proper
way if any function fails
Signed-off-by: Devendra Naga <devendra.aaru@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/ft1000/ft1000-usb/ft1000_usb.c

@@ -71,7 +71,7 @@ static int ft1000_probe(struct usb_interface *interface,
 
 	if (!ft1000dev) {
 		printk(KERN_ERR "out of memory allocating device structure\n");
-		return 0;
+		return -ENOMEM;
 	}
 
 	memset(ft1000dev, 0, sizeof(*ft1000dev));