Add missing linefeed in error message

The error message for an unknown network device given to
monitor command set_link looks better with a terminating
linefeed.

Signed-off-by: Stefan Weil <weil@mail.berlios.de>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/net.c b/net.c
index 1b531e7..beba552 100644
--- a/net.c
+++ b/net.c
@@ -2917,7 +2917,7 @@
 done:
 
     if (!vc) {
-        monitor_printf(mon, "could not find network device '%s'", name);
+        monitor_printf(mon, "could not find network device '%s'\n", name);
         return;
     }