Added a suppression pattern.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@8834 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/glibc-2.X-drd.supp b/glibc-2.X-drd.supp
index 46b9de2..ac31c30 100644
--- a/glibc-2.X-drd.supp
+++ b/glibc-2.X-drd.supp
@@ -71,6 +71,10 @@
    fun:random_r
 }
 {
+   libc:stdio
+   fun:_IO_file_xsputn*
+}
+{
    librt
    drd:ConflictingAccess
    fun:__librt_enable_asynccancel