Initialise a local variable, so as to stop gcc-4.7.2 complaining that
some part of it is used uninitialised.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13272 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/perf/tinycc.c b/perf/tinycc.c
index 3ee2b19..d97bc33 100644
--- a/perf/tinycc.c
+++ b/perf/tinycc.c
@@ -9848,7 +9848,7 @@
     CValue cval;
     TokenString macro_str1;
     CString cstr;
-
+    memset(&cval, 0, sizeof(cval));
     start_macro_ptr = macro_str;
     /* we search the first '##' */
     for(;;) {