fix asan compile error

deps/oblib/src/lib/alloc/ob_malloc_allocator.cpp

@@ -94,7 +94,7 @@ void *ObMallocAllocator::alloc(const int64_t size)
 void *ObMallocAllocator::alloc(const int64_t size, const oceanbase::lib::ObMemAttr &_attr)
 {
 #ifdef OB_USE_ASAN
-  UNUSED(attr);
+  UNUSED(_attr);
   return ::malloc(size);
 #else
   SANITY_DISABLE_CHECK_RANGE(); // prevent sanity_check_range

deps/oblib/src/lib/resource/achunk_mgr.h

@@ -60,7 +60,7 @@ public:
   void set_max_chunk_cache_size(const int64_t max_cache_size)
   {
 #ifdef OB_USE_ASAN
-    UNUSED(size);
+    UNUSED(max_cache_size);
     max_chunk_cache_size_ = 0;
 #else
     max_chunk_cache_size_ = max_cache_size;