fix tablet_allocator double free

src/observer/virtual_table/ob_all_virtual_table_mgr.cpp

@@ -110,6 +110,7 @@ int ObAllVirtualTableMgr::get_next_tablet()
 {
   int ret = OB_SUCCESS;
 
+  tablet_handle_.reset();
   tablet_allocator_.reuse();
   if (nullptr == tablet_iter_) {
     tablet_allocator_.set_tenant_id(MTL_ID());

src/observer/virtual_table/ob_all_virtual_tablet_compaction_info.cpp

@@ -108,6 +108,7 @@ int ObAllVirtualTabletCompactionInfo::get_next_tablet()
 {
   int ret = OB_SUCCESS;
 
+  tablet_handle_.reset();
   tablet_allocator_.reuse();
   if (nullptr == tablet_iter_) {
     tablet_allocator_.set_tenant_id(MTL_ID());

src/observer/virtual_table/ob_all_virtual_tablet_sstable_macro_info.cpp

@@ -502,6 +502,7 @@ int ObAllVirtualTabletSSTableMacroInfo::process_curr_tenant(common::ObNewRow *&r
 int ObAllVirtualTabletSSTableMacroInfo::get_next_tablet()
 {
   int ret = OB_SUCCESS;
+  tablet_handle_.reset();
   tablet_allocator_.reuse();
   if (nullptr == tablet_iter_) {
     tablet_allocator_.set_tenant_id(MTL_ID());