sync: Fix tracking of broken links

Change-Id: Ice4f4cc745cbac59f356bd4ce1124b6162894e61
Bug: b/113935847
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/390434
Tested-by: Jason Chang <jasonnc@google.com>
Reviewed-by: Josip Sokcevic <sokcevic@google.com>
Reviewed-by: Mike Frysinger <vapier@google.com>
Commit-Queue: Jason Chang <jasonnc@google.com>
diff --git a/subcmds/sync.py b/subcmds/sync.py
index 48ceb46..2fea61d 100644
--- a/subcmds/sync.py
+++ b/subcmds/sync.py
@@ -1776,7 +1776,6 @@
                     logger.error("error: Local checkouts *not* updated.")
                     raise SyncFailFastError(aggregate_errors=errors)
 
-            err_update_linkfiles = False
             try:
                 self.UpdateCopyLinkfileList(m)
             except Exception as e: