MDEV-25967: Correctly extend deferred-recovery files

recv_sys_t::recover_deferred(): Set the file size to match the number
of pages. Mariabackup might copy the file while it was being extended.

storage/innobase/log/log0recv.cc

@@ -837,14 +837,19 @@ bool recv_sys_t::recover_deferred(recv_sys_t::map::iterator &p,
       block->unfix();
       fil_node_t *node= UT_LIST_GET_FIRST(space->chain);
       node->deferred= true;
-      if (space->acquire())
+      if (!space->acquire())
+        goto fail;
+      if (!os_file_set_size(node->name, node->handle,
+                            size * fil_space_t::physical_size(flags),
+                            space->is_compressed()))
       {
+        space->release();
+        goto fail;
+      }
       node->deferred= false;
       space->release();
       return false;
     }
-      goto fail;
-    }
 
     block->unfix();
   }