Address CoPilot review

Author: zwoop

doc/admin-guide/files/records.yaml.en.rst

@@ -2573,6 +2573,7 @@ Cache Control
    :units: millisecond
 
    How long to wait between each write cycle when syncing the cache directory to disk.
+
 .. ts:cv:: CONFIG proxy.config.cache.dir.sync_parallel_tasks INT 1
    :reloadable:
 

src/iocore/cache/P_CacheDir.h

@@ -271,6 +271,9 @@ struct CacheSync : public Continuation {
       }
     }
   }
+  buf      = nullptr;
+  buflen   = 0;
+  buf_huge = false;
 };
 
 struct StripteHeaderFooter {