Cache: Fix for OS X 10.5 compiling.

--HG--
extra : convert_revision : ba3c33ed524367280eefc096177d767168ac2cf6
diff --git a/src/mem/cache/tags/iic.cc b/src/mem/cache/tags/iic.cc
index 2f95cdb..20babe6 100644
--- a/src/mem/cache/tags/iic.cc
+++ b/src/mem/cache/tags/iic.cc
@@ -233,7 +233,7 @@
     unsigned set = hash(addr);
     int set_lat;
 
-    unsigned long chain_ptr;
+    unsigned long chain_ptr = tagNull;
 
     if (PROFILE_IIC)
         setAccess.sample(set);
@@ -291,7 +291,7 @@
     Addr tag = extractTag(addr);
     unsigned set = hash(addr);
 
-    unsigned long chain_ptr;
+    unsigned long chain_ptr = tagNull;
 
     IICTag *tag_ptr = sets[set].findTag(tag, chain_ptr);
     if (tag_ptr == NULL && chain_ptr != tagNull) {