Print worker thread name as a c-string, not a vector. Otherwise, the
output is certain to contain a NULL byte.

Change-Id: Id80e1334d7a2cb6788f1db33cde142f84826db36
Signed-off-by: Dave Barach <dave@barachs.net>
diff --git a/vlib/vlib/node_cli.c b/vlib/vlib/node_cli.c
index 59f5623..13a1b91 100644
--- a/vlib/vlib/node_cli.c
+++ b/vlib/vlib/node_cli.c
@@ -335,10 +335,10 @@
                 vlib_cli_output (vm, "---------------");
 
               if ( w->dpdk_lcore_id > -1)
-                vlib_cli_output (vm, "Thread %d %v (lcore %u)", j, w->name,
+                vlib_cli_output (vm, "Thread %d %s (lcore %u)", j, w->name,
                                  w->dpdk_lcore_id);
               else
-                vlib_cli_output (vm, "Thread %d %v", j,
+                vlib_cli_output (vm, "Thread %d %s", j,
                                  w->name);
             }