Remove unused va_list variable that was introduced by mistake in the last patch
to stdarg handling.
diff --git a/lib/vty.c b/lib/vty.c
index 2f3bac2..bf1eec3 100644
--- a/lib/vty.c
+++ b/lib/vty.c
@@ -114,8 +114,6 @@
 	{
 	  while (1)
 	    {
-	      va_list ac;
-
 	      if (len > -1)
 		size = len + 1;
 	      else