Fix VG_(snprintf) missing arg in inner setup


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14584 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/coregrind/m_redir.c b/coregrind/m_redir.c
index 4d41aec..4ca93dc 100644
--- a/coregrind/m_redir.c
+++ b/coregrind/m_redir.c
@@ -458,7 +458,7 @@
 
          HChar in_vglib_filename[VG_(strlen)(VG_(libdir)) + 1 +
                                  VG_(strlen)(newdi_basename) + 1];
-         VG_(sprintf)("%s/%s", VG_(libdir), newdi_basename);
+         VG_(sprintf)(in_vglib_filename, "%s/%s", VG_(libdir), newdi_basename);
 
          in_vglib_res = VG_(stat)(in_vglib_filename, &in_vglib_stat);