xmllint: Build fix for endTimer if !defined(HAVE_GETTIMEOFDAY)

For https://bugzilla.gnome.org/show_bug.cgi?id=638649
code was broken !
diff --git a/xmllint.c b/xmllint.c
index 39d7138..3ca8077 100644
--- a/xmllint.c
+++ b/xmllint.c
@@ -520,10 +520,11 @@
      * We cannot do anything because we don't have a timing function
      */
 #ifdef HAVE_STDARG_H
+    va_list ap;
     va_start(ap, format);
     vfprintf(stderr, format, ap);
     va_end(ap);
-    fprintf(stderr, " was not timed\n", msec);
+    fprintf(stderr, " was not timed\n");
 #else
     /* We don't have gettimeofday, time or stdarg.h, what crazy world is
      * this ?!