Remove a duplicate const qualifier complained about by clang 3.3


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13597 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/helgrind/libhb_core.c b/helgrind/libhb_core.c
index 05ba817..8f30fe5 100644
--- a/helgrind/libhb_core.c
+++ b/helgrind/libhb_core.c
@@ -6492,7 +6492,7 @@
    if (XXX2 && a <= XXX2 && XXX2 <= a+szB) return True;
    return False;
 }
-static void trace ( Thr* thr, Addr a, SizeT szB, const const HChar* s ) 
+static void trace ( Thr* thr, Addr a, SizeT szB, const HChar* s ) 
 {
   SVal sv = zsm_sread08(a);
   VG_(printf)("thr %p (%#lx,%lu) %s: 0x%016llx ", thr,a,szB,s,sv);