Fix uninitialized variable.

Valgrind complains if any data passed to a syscall is uninitialized,
even though logically, kernel will not use part of it. This commit
shuts down the warning.


[SVN r46159]

libs/test

@@ -1 +1 @@
-Subproject commit 3ee7c0990d8011dbf6e239f480054ae1661ae7bc
+Subproject commit 41eb47789f6e518bba4f2f948bde828761b4d492