[PATCH] Fix 8139too device close

Starting with 2.5.61, 8139too takes forever (30+ seconds) to take an
interface down.  This gets the driver back to regular fraction of a
second time.

The thread exit code assumes it can use SIGTERM to kill the driver
thread, not SIGKILL.

drivers/net/8139too.c

@@ -1589,7 +1589,7 @@ static int rtl8139_thread (void *data)
 	unsigned long timeout;
 
 	daemonize("%s", dev->name);
-	allow_signal(SIGKILL);
+	allow_signal(SIGTERM);
 
 	while (1) {
 		timeout = next_tick;