alloc/aligned/foreign: actually correct the allocated address

alloc/raw/aligned/foreign.hpp

@@ -70,7 +70,8 @@ namespace cruft::alloc::raw::aligned {
         cruft::view<u08*>
         allocate (std::size_t bytes)
         {
-            return m_successor.allocate (bytes);
+            auto res = m_successor.allocate (bytes);
+            return { res.begin () + m_offset, bytes };
         }