Add comment before call to unique_ptr::release method

Author: oleksandr-pavlyk

dpctl/tensor/libtensor/include/utils/sycl_alloc_utils.hpp

@@ -206,6 +206,10 @@ sycl::event async_smart_free(sycl::queue &exec_q,
             }
         });
     });
+
+    // Upon successful submission of host_task, USM allocations are owned
+    // by the host_task. Release smart pointer ownership to avoid double
+    // deallocation
     (unique_pointers.release(), ...);
 
     return ht_e;