stats: strings in string vector are c strings

Type: fix
Change-Id: I9cf9376f2813f7bceecc6a9d714dcb98df77615d
Signed-off-by: Damjan Marion <damarion@cisco.com>
diff --git a/src/vlib/stats/stats.c b/src/vlib/stats/stats.c
index ee65708..e3a1a8a 100644
--- a/src/vlib/stats/stats.c
+++ b/src/vlib/stats/stats.c
@@ -341,6 +341,7 @@
   va_start (va, fmt);
   s = va_format (s, fmt, &va);
   va_end (va);
+  vec_add1 (s, 0);
 
   e->string_vector[vector_index] = s;