The recently added cache data members of the bitmap structure are now initialized properly.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@7699 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/exp-drd/drd_bitmap.c b/exp-drd/drd_bitmap.c
index 26963ee..2f14b44 100644
--- a/exp-drd/drd_bitmap.c
+++ b/exp-drd/drd_bitmap.c
@@ -59,7 +59,9 @@
 
   bm = VG_(malloc)(sizeof(*bm));
   tl_assert(bm);
-  bm->oset = VG_(OSetGen_Create)(0, 0, VG_(malloc), VG_(free));
+  bm->last_lookup_a1     = 0;
+  bm->last_lookup_result = 0;
+  bm->oset               = VG_(OSetGen_Create)(0, 0, VG_(malloc), VG_(free));
 
   s_bitmap_creation_count++;