Remove redundant NULL check.

R=mvstanton@chromium.org

Review URL: https://codereview.chromium.org/108363008

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18491 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/objects.cc

@@ -12778,7 +12778,7 @@ const double AllocationSite::kPretenureRatio = 0.60;
 bool AllocationSite::IsNestedSite() {
   ASSERT(FLAG_trace_track_allocation_sites);
   Object* current = GetHeap()->allocation_sites_list();
-  while (current != NULL && current->IsAllocationSite()) {
+  while (current->IsAllocationSite()) {
     AllocationSite* current_site = AllocationSite::cast(current);
     if (current_site->nested_site() == this) {
       return true;