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 0b531a6..413292b 100644
--- a/net.c
+++ b/net.c
@@ -2946,7 +2946,7 @@
 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;
     }