[TUNTAP]: Fix wrong debug message.

This is a trivial fix of debug message.
When a persist flag is set, the message should say "enabled".
Signed-off-by: NToyo Abe <tabe@miraclelinux.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/tun.c

@@ -610,7 +610,7 @@ static int tun_chr_ioctl(struct inode *inode, struct file *file,
 			tun->flags &= ~TUN_PERSIST;
 
 		DBG(KERN_INFO "%s: persist %s\n",
-		    tun->dev->name, arg ? "disabled" : "enabled");
+		    tun->dev->name, arg ? "enabled" : "disabled");
 		break;
 
 	case TUNSETOWNER: