Minor fixes

Author: mjp41

src/snmalloc/global/scopedalloc.h

@@ -60,9 +60,12 @@ namespace snmalloc
      */
     ~ScopedAllocator()
     {
-      alloc->flush();
-      AllocPool<typename SAlloc::Config>::release(alloc);
-      alloc = nullptr;
+      if (alloc != nullptr)
+      {
+        alloc->flush();
+        AllocPool<typename SAlloc::Config>::release(alloc);
+        alloc = nullptr;
+      }
     }
 
     /**

src/snmalloc/mem/corealloc.h

@@ -1335,11 +1335,10 @@ namespace snmalloc
           continue;
 
         // All elements should have the same entry.
-        const auto& entry =
-          Config::Backend::get_metaentry(small_fast_free_lists[i].peek());
+        const auto& entry = Config::Backend::get_metaentry(
+          address_cast(small_fast_free_lists[i].peek()));
         do
         {
-          // return each element
           auto p = small_fast_free_lists[i].take(key, domesticate);
           SNMALLOC_ASSERT(is_start_of_object(
             sizeclass_t::from_small_class(i), address_cast(p)));

src/test/func/thread_alloc_external/thread_alloc_external.cc

@@ -71,7 +71,7 @@ int main()
     snmalloc::dealloc(r1);
   }
 
-  snmalloc::debug_teardown();
+//  snmalloc::debug_teardown();
 
   // This checks that the scoped allocator does not call
   // register clean up, as this configuration will fault